4L60E: 1-2 Shift Valve + 1-2 Shift Solenoid (Part 1) Basic Operation
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- Опубликовано: 2 апр 2022
- Learn how the 4L60E 1-2 Shift Valve works (and the 1-2 shift solenoid)(Shift Solenoid A). When there are problems with this shift valve and solenoid, it leads to number of 4L60E problems;
1). 4L60E no 1st gear.
2). 4L60E no 2nd gear.
3). 4L60E no 3rd gear.
4). 4L60E no 4th gear.
4). Etc.
Before we can address the problem areas, it's important to first understand the basics of how a healthy system works. Buckle up!
Note: the 4L60E 1-2 Shift Solenoid is also known as Shift Solenoid A.
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DISCLOSURE: 🕵
Links provided are affiliated links with the associated websites. While there is no extra cost to the purchaser, a small portion of the sale goes to support this RUclips channel. 
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Does this also go for the 4l80e I have codes 81 82 83 👍
I don't know the history of the transmission I just bought the vehicle and it'll go in reverse neutral and first and second gear and that's it
Understood.
Chances are, the 3-4 Clutch is smoked. Super common problem on this transmission.
As the name implies, the 3-4 Clutch is partially responsible for 3rd gear and 4th gear.
I have a 1997 c1500 with 4l60e 1-piece case. Keep getting P0758 and have replaced both A and B shift solenoids. I can command them on /off through PCM and voltage drop occurs …they work . Can mechanical problem in valve body or transmission still cause P0758? No debris or clutch material found in pan …clean with normal metallic sludge on magnet
Is the trans missing/skipping 2nd or 3rd gear?
What's the history on trans?
High mileage unit? Recently rebuilt?
To answer your question...
Yes, there are mechanical, and hydraulic, problems that can exist in the valve-body, that can cause this code.
Shoot me some more info, and I'll see if I can get you pointed in the right direction.
Automatic transmissions have now entered the realm of magic for me. Unreal that you can explain this.
I'm in awe that people created these things.
I've only watched this one video of yours and I am coming to the conclusion quickly and I believe you may have the best transmission videos on the internet at least for explaining to the beginner thank you for your service
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you could do alot worsethan watching and listening to this channel. Even my girlfriend(not very mechanically inclined)undrstood the content. cheers frrom Calgary.
Right on!!
2 min in video and I agree with you 100%
🙏
using that color coding to show the inner workings of the 4L60E transmission is a quality mark of a genius. No hesitations in your explanations and smooth talking puts your web page at the top of the list compared to what i seen in other show and tells. You are the grand master of your intellect for perpetrating such awesome detail to your audience. Kudo's go out to you sir.
I can't thank you enough to help me understand this type of transmission down to every detail. Transmissions were always a "hands off" thing to me because of their complexity making them so intimidating. Your videos really paid because they make understanding this transmission so easily. I've watched many other videos and they still left me scratching my head. So again sir, thank you for taking the time to make these videos to help people like me get the best understanding and gain the knowledge from a true expert. 👍👍
Right on! Glad to hear that.
Your interest in this subject is appreciated.
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PS I've got plans of making more video content, like this. Just a matter of time...
The best in depth explanation video for any transmission I've ever seen👍👍
Your videos are so detailed and easy to follow. Thank you!
Thanks for stopping by and checking it out!
I'm excited for you to get your fitness videos rolling. You're gonna do awesome...I just know it.
One of the more in depth videos I've seen. Definitely subscribing.
Right on!
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Great videos! Best informational videos about how a 4l60e works on youtube!
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1 Handed Transmission Rebuilder: (60-Sec Preview)
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Love your videos. So clear with great visual explanations and animations. They are perfect. You obviously put alot more work into your videos than just turning on a recording camera. I'm gonna watch more ot them.
Wow, thank you!
You knowledge and ability to communicate is unprecedented!!!!
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@@SouthpawAutoworks will do. Thank you again
Amazing way to explain the basic! Awesome work!! Fully subscribed!!
Thanks, Alejandro! Welcome aboard!
@@SouthpawAutoworks Thank you! Your explanation helps me a lot! I'm trying to make a test bench for automatic transmission from the electronic point of view and honestly have no idea of the basic to start the project. Thank you again!!
GOOD ANIMATIONS caused my clear understanding. Thanks a lot
Right on!
Спасибо тебе Роберт за твой канал. Он помогает мне многое понять. Ты великолепный учитель! Thank you!
Положительный отзыв приветствуется.
Спасибо.
Great video . I like these explanations . You really make things clear . Thank you .
That's great to hear. Happy to share.
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1 Handed Transmission Rebuilder: (60-Sec Preview)
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Beautiful explanation Southpaw ;;;;
Crystal Clear & Simple - Thanx Guy 😊
My pleasure.
Thanks for dropping me a line!
Excellent explanation....No such detailed videos on internet about automatic transmission......This is the best channel for learning automatic transmission....
Really appreciate the positive feedback.
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Incredibly helpful explanation
Glad to hear that!
Thanks for the video! Best explain on youtube so far!
Right on!
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Great video, you should do a weekend Rebuild Transmission Seminar👍
Dude great video lol I was double checking removing a transmission for a rear main seal and came across your channel very insightful
Right on!
Glad you found the channel.
Tip of the hat 2 uu Legend , I deeply appreciate your time your sacrifice for tha better of us ❤
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Nice job! Good illustrations!
Appreciate it!
Thanks for 'arming' folks with some more knowledge! Seriously, that was well played sir! Great work! I like to teach people the basics in a powershift transmission, which is extremely similar to a complex 'auto' trans, but without any of the valving. Usually 1-3 clutch stacks and a F/R stack. That's it.
The positive feedback is appreciated.
John Deere power-shift? Right on!
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1 Handed Transmission Rebuilder: (60-Sec Preview)
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@@SouthpawAutoworks It took me a few views to fealize thatyou only ha d the one hand, just goes to show that you can fix a tranny with only one hand as long as you have the motivaton to overcome problems in life
1 Handed Automatic Transmission Builder:
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Another great educational video. Thank you, Sir.
Glad you enjoyed it.
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i know nothing about cars, but holy heck this is helpful for understanding these kind of structures.
Right on.
Glad you enjoyed it.
well explained aPic is Worth a thousand Words!!! THanks for Sharing!!
My pleasure!
Very great information. I plan on using your videos in our class at our Tech Center to help my students understand automatic transmissions. Outstanding. Great visuals.
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Fantastically explained
Glad you liked it.
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Real g 🔥 with the ending of the video thanks boss
Thank you so much for this video!! Man you are just amazing!! Keep on doing that! I loveeee it!
Good to hear from you again. Glad you're enjoying the videos.
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Like always....
If it feels right to you, please help me spread the word about this channel.
Here's an easy way to share.
60-Second Preview of the video you just watched:
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What an amazingly detailed video. Mine randomly slips while in 4th gear so I got the shift solenoids & torque converter pwm solenoid, hoping that fixes the problem, but I really wanted more information on how those solenoids work and what they do. This video is a big help in understanding how the transmission works. I subscribed.
Here's a video dedicated to the shift solenoids.
4L60E Shift Solenoid - Part 1 (Basic Operation): ruclips.net/video/FaChWmcsAgI/видео.html
That condition could be caused by a number of things. Hoping to get back to creating more 4L60E videos, soon. Got a lot of different topics to cover, including this one.
Currently busy working on a TH400 build series.
ruclips.net/p/PLMK9OC5NGhbgVgAwDO_rCGFF38T1LjkS7
The positive feedback (and the subscription) is appreciated.
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I really appreciate all that you do it helps tremendously my question is I recently changed the oil and filter in my 4l60e the reason for this is when I reach 30 mph its like it goes into neutral while I had the pan and off out of the way I was checking out the shift solenoids when I pushed in on them the one closest to the front of the transmission it would come back out on it's own the other one I had to pull it back out is this normal or should they be charged because it is still doing the same thing as before
Regarding the solenoids, that's normal. One solenoid is under spring tension. The other is not.
If the trans is trying to shift into 3rd gear, and instead of getting 3rd gear, it feels like neutral, chances are that the 3-4 Clutch is failing. As the name implies, it partially responsible for creating both 3rd gear and 4th gear.
It's a very common failure point on the 4L60E.
Best 4l60e info!!!!!
Right on! Glad you're enjoying the content.
Your videos are awesome!
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best explanation on youtube, makes it easier for a rookie like me to learn, thanks have hit subscribe.
Right on! Welcome aboard!
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This will make you respect transmissions much more. They’re so complicated it’s insane
There's def a lot going on, all at once.
மிக்க நன்றி அருமையான பதிவு👏👏👏
Great video. Very informative
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1 Handed Transmission Rebuilder: (60-Sec Preview)
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Wonderful Presentation.....YOU JUST WON A NEW SUBSCRIBER...THANKS
Welcome aboard!
The positive feedback is appreciated. Thanks for dropping me a line, Jose.
Great video and very informative.
Thank you!
Awesome video! Great share. Thank you for helping me teach my boys! 🤙🏼🍻
Right on!
You bet!
Excellent video!
The positive feedback is appreciated.
The positive feedback is greatly appreciated.
Thanks for taking the time to check it out.
Thanks for dropping me a line!
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1 Handed Transmission Rebuilder: (60-Sec Preview)
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you doing great brother i really liked this explanation
Glad you liked it.
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1 Handed Transmission Rebuilder: (60-Sec Preview)
ruclips.net/video/y3Vixa_Ec1E/видео.html
How the 4L60E valve-body works: (60-Second Preview)
ruclips.net/video/fWPSaLeaOXI/видео.html
Robert, thanks for making this video. Subbed and thumbs up! The animation and narration is clear and top shelf.
I think I understand it enough to diagnose a loss of line pressure just before going to 2nd. If I put into drive the PSI is 60 then when I begin to accelerate from a stop it drops to 30psi (yikes) for a second and it feels as though the trans is slipping or really just in limbo as the rpms don't spike. The line pressure goes to 60PSI and it feels like normal and is in 2nd. It does this in overdrive, manual 1st, 3rd, and 4th but not 2nd as it starts off in 2nd. Also of note is if I creep up slowly the rpms when leaving a stop the PSI doesn't drop, it's only when I accelerate normally and only momentarily. I'm guessing this is a sticky 1-2 shift valve or a weak/broken spring on the 1-2 shift valve causing a slow return after the solenoid is commanded off. Any thoughts?
The 1-2 shift valve redirects/permits oil flow.
In 1st gear, it's a "closed door." When the PCM commands 2nd gear, the valve becomes an "open door," letting oil flow through/past the valve, and to the 2-4 Servo.
There are a number of things that affect line pressure:
Pump speed (engine RPM), pump volume (pump slide position), PR Valve (affects pump slide), etc.
Also, the integrity of a clutch circuit will affect line pressure. Ideally, we want no leaks in any a given circuit. When we have leaks, we lose oil pressure (line pressure).
There's more info, on a number of these topics....if you're interested.
4L60E Pump:
How Does it Work: ruclips.net/video/gJ5CdPJoJyg/видео.html
4L60E PR Valve:
Part 1: ruclips.net/video/ELhJlZridIY/видео.html
Part 2: ruclips.net/video/dJlUec91kgY/видео.html
Part 3: ruclips.net/video/PY1trZeLqTM/видео.html
4L60E AFL Valve:
ruclips.net/video/LqBkdegPjNk/видео.html
4L60E Shift Solenoid:
ruclips.net/video/FaChWmcsAgI/видео.html
4L60E Shift Valve:
ruclips.net/video/jPhm76RDz6Y/видео.html
I loved it.🎉
Watched it in 1.75x and still got everything smooth into my brain 🧠
Now I'll have more proper knowledge while going to the mechanic and resolving my Toyota Harrier / Lexus Rx330 gearbox problem
Right on.
@SouthpawAutoworks BTW I got my transmission replaced for the peace of mind 😅
The shifts are smooth, it is just that when I floor the car. The gear takes lag to shift and a bit of aggressive shift. Perhaps can consider this from a V6 engine 3mz
Great information and videos thanks Robert
You bet! Appreciate you checking it out.
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1 Handed Transmission Rebuilder: (60-Sec Preview)
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@@SouthpawAutoworks I’m always sharing this information across all of the Transmission groups on Facebook and my page as well. I think it’s very important that the do it yourself builders and others that want to learn get to know this information regarding fluid circuits valving and pump operation keep it up it’s good Material to learn from and you have a great way of presenting and explaining everything. you have multi talents
What a guy!
Thanks for helping me spread the word.
Your encouragement is very appreciated.
Thanks for dropping me a line. Always good to hear from you!
Amazing video, thank you
Glad you enjoyed it.
Thank you for dropping me a line.
Thank you so much for this lesson
You're welcome.
Thanks for dropping me a line.
I repair valvebodies at gm. Let me tell you these videos have made my job way easier figuring out why a valve was failing
Right on!
What a great video👍🏻
Glad you liked it.
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Thanks for the video. im diagnosing a freshly rebuilt 4660e that wont downshift back to first . using this and not having any diagnostic codes i was able to determine my problem is not the 1-2 solenoid. so on to the next video
Interesting...
If you shift it into Manual 1st ("1" on the shifter), what happens?
Very informative thank you
Thanks for checking this one out.
Got plans for other similar 4L60E videos (hydraulics).
It's just a matter of making the time to get each one done.
Thanks for dropping me a line, Ken.
Very nice for ur basic teacher from mechanic Pinoy thanks 🙏
My pleasure.
Thanks for dropping me a line!
Really helpful videos, might have more questions as my project gets closer to this point. I’m trying to get to where I can do 1-2 and R only and handle lotta power by myself
Right on, that's awesome! You got this...
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1 Handed Transmission Rebuilder: (60-Sec Preview)
ruclips.net/video/y3Vixa_Ec1E/видео.html
How the 4L60E valve-body works: (60-Second Preview)
ruclips.net/video/fWPSaLeaOXI/видео.html
great info!
Appreciate your comment.
You are doing well thanks and regards ❤🎉
Thank you for dropping me a line.
Love the videos. Just came across mine not wanting to shift into last at 50-55 Just more rpm not shifting No codes
Could be dealing with an AFL Valve that's wore out (actually the valve bore). Could also be a leaking bore plug for the 4-3 Sequence Valve.
I would imagine that you'd have a code, though. If the PCM is commanding the trans to up-shift to 4th gear, the PCM will expect to see the engine RPM drop, after the shift. When it does not drop, the PCM may throw a code for incorrect gear ratio.
Im working on JF015E/RE0F11A just now and man i wish there was some videos as good as thses for it, the explanation ofg the hydraulic system is the best iv seen
Really appreciate the positive feedback.
November 5, 2022- Follow up to my 2nd post. Received the PCM I bought on Ebay ( by Flashmasters) and it fixed the transmission immediately. No more Shift solenoid B Fault and no more default 3rd gear. I was almost defeated after rebuilding an obviously burned up transmission only to install it and have the same fault that I started with. So, pay close attention to your scan tool solenoid open/short to ground/short to volt faults, because it very well could be the PCM. It is natural to assume an old truck has wiring harness issues, but don't overlook the PCM itself . And don't assume your vehicle only has one problem....in this case the tranny was indeed burned up but the PCM was also completely defective, because its internal volt meter was permanently stuck on 0V as it activated and monitored the B solenoid
Great video and very informative. I have a question… I have a 1995 Camaro that seems to be missing second gear. First gear pulls normal however it won’t shift to second, if you lead off of the throttle it will jump straight to third and then fourth operates totally normal as well. If you step on the throttle enough to where it goes to downshift into second gear it will just rev almost like neutral. Can you help me out diagnosing this? Thanks
Did you ever figure this out??
interesting & informative..thx
Glad you enjoyed it.
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It's not until you watch a video like this that you actually get an appreciate of the genius that went into something we take for granted every day. Just coming up with the concept is one thing? Buy then actually engineere it, that's a whole new beast. Anyway I have a question for anyone who might be able to help? I'm running the 4L60e transmission and recently had work done to the motor. A full rebuild with a few modifications. A stage 2 cam. Performance headers into 2 & half" exhaust with high flow cats. As well as a cold air performance intake. Plus a few other tweaks. So now the shift points are out and other than dropping a manual gearbox in. And or fitting a stand alone transmission system? Is there a way it can adjust the shift points using a GM Tech 2 scan tool that is specifically set up for my model of car. It's the same one the dealership use when they go over it? And seeing that I've now modified the engine shouldn't have the PCM tuned /programmed to match the the newly modified engine? I was told that if I had the proper scan tool which I do. Can anyone give me a heads up on programming a PCM. Any help would be much appreciated.
Thanks very much brother I'm very interested on what you xplain
You're very welcome. I'm glad you're here.
More videos please!
I'm all over it...like a bad rash! ha
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1 Handed Transmission Rebuilder: (60-Sec Preview)
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Recently I rebuilt the 4l60e I commented on two weeks ago... the 2/4 input drum blue and band slipping (no 2nd or 4th gear) . Now the tranny is rebuilt, both shift solenoids replaced 2/3 shuttle valves inspected (smooth movement in the bore) and I replaced internal tranny wiring harness. But same 2/3 solenoid electrical fault occurs , but now AFTER the 2-3 shift occurs ..... Interestingly I can shift through every gear using scan tool from 1 to 4 and I have every gear going down the road. I can also downshift from 4 to 1 using the scan tool no problem. However, if I clear fault, and start from stop , it will shift from 1st to 2nd and from 2nd to 3rd, then about 2-3 seconds after the shift to 3rd , check engine light comes on and now I'm in failsafe 3rd gear again. (same 2/3 solenoid "B" electrical fault) . Since the 2/3 solenoid is commanded OFF for 3rd gear, I'm thinking this might be a problem inside the PCM, or PCM is not seeing the voltage rise fast enough after solenoid turned off . I can command the 2/3 solenoid on and off with scan tool and I hear it click on / off in the pan every time. Now I am starting to think the 2/4 band and drum originally burned up because previous owner was constantly using manual 2nd to start off and flicking to 3rd, since tranny was in failsafe all the time ( he died, so asking him is out of the question.) . I suspect this because the shift cable was originally misadjusted so that manual valve would only move to manual 2nd and not to manual 1st. You could physically not move it to manual 1st. Not sure what is going on, but definitely going to school on this one.
Thank you foe the clear explanation, please explain also about the accumulator, what is the function while several case 4l60e harsh shift 1-2 while the plastic accumulator is tear and wear. Thx
Hi, as always great videos and very informative.
I have a question if you don't mind.
I have 2016 ford escape 1.6 ecoboost.
The only problem that I have in my automatic transmission is a 2 seconds grinding noise before a strong engaging when I turn the gear from neutral or parking into drive, into reverse is fine.
I tried draining and refilling the transmission fluid 3 Times so far and it is not improving.
I am currently confused and wondering is it a transmission gear issue or solenoid or valve body or the power transfer unit/case.
If by any chance you have any suggestions I would appreciate it! Thanks
First great channel. I have learned quite a bit from your video series and they're put together amazing. Thank you.
I have a question about reverse in a 04 suburban 4l60e. It's a rebuilt transmission from global transmission has approximately 45000 on it. Has had regular fluid and filter changes since I put it in. I do light towing, small boat, dirt bikes at most about 1 ton of weight.
Reverse is now becoming hard to engage. When put in reverse it acts like it is slipping at first. With light reving of the Engine it will slowly creep backwards if on flat ground. If on a slope nose of car pointing down, trying to back up a hill it will not move. If you feather the throttle it will eventually engage. Sometimes with a clunk sometimes just slips right in. Once engaged I have full reverse no slip works great. I have checked the fluid. Nice red color no smells of burnt clutch. I've drained just a bit of fluid, not a full change , but no signs of clutch material or metal particles. I've watched and read multiple things on reverse issues on the 4l60e but non seem to target my specific problem. I've been driving it like this for the past 3 months. I know not exactly the right thing to do. But the symptoms have not changed it seems no worse than when it first happened. Yes this was an immediate problem. Worked fine then one day it didn't. Would truly appreciate your thoughts. Just trying to figure out if this is a sun shell issue, servo issue, reverse pressure boost , or maybe even a shift solenoid issue. Or is it just screwed and I once again need a new transmission.
Thank you for your time
That's interesting...
It has me wondering if the shifter is not adjusted correctly. I understand that this problem has occurred out of nowhere. Always good to circle back to the basics, and go from there.
Questions:
1). When the problem arises, if you move the shifter ever so slightly to the left (and/or to the right) of Reverse, does this affect the symptom?
2). When the problem occurs, can you stop trying Reverse, and manually shift the trans to "1". Accelerate to a speed that would make sense to upshift....but, instead of up-shifting, just let your foot off of the gas. What happens?
A). Does the vehicle coast as though it's in Neutral?
B). Or does the vehicle quickly decelerate (engine braking)?
Thank you for the positive feedback!
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Moving the shifter in any direction doesn't effect it. I've also checked the cable and shift position it moves as it should and locks into each shift position correctly. As for deceleration in first it does not coast when lifting off the accelerater. I should also mention it shifts perfectly in all other gears I can also manually shift through the gears properly. Fluid has always been kept at recommended levels using ac Delco fluid.
I've been researching the shift manifold. Could the diaphragm be cracked in that not creating the proper signal?
Thank you for your help. Just trying to diagnose this properly before just throwing parts at it.
Dude this is damn amazing
Glad you enjoyed it.
Appreciate your comment.
Thank-you🙏
You're welcome.
Thanks for sharing bigbig knowledge. Giving the gift. Spiritual giant.bless bless
There's two primary joys in life; Growing & Giving (Tony Robbins).
Creating these videos fulfills both of those joys.
Thanks for dropping me a line.
Hey man great video thank you! I’m having issue with my 4l60e. I have no second gear when the trans is cold, below roughly 100 degrees. After driving for about 5 minutes, everything operates normally. I’m stumped. Fluid level is ok.
maybe not enough oil presure when cold
Good info
Thanks
Nice bro!
Thanks for stopping by! Always good to hear from you.
Great videos mate very easy to follow along. Im currently looking for the reason my silverado 4l60e feels like it slips/hesitates until i add rpm when selecting drive. Seems fine when cold but gets worse as it warms up. Reverse is normal with no issues and the car will drive along fine just slips from a stopped start. Any help would be greatly appreciated 👍
96 Express van w/5.7L engine. Went on a long trip, 8 hrs, hot day. On the way home got caught in stop and go freeway traffic, after about 10 minutes, 1st gear would bang into 2nd, going to check fluid level today, no leaks, has approximately 84K miles. I read something about a TFF solenoid? Thanks in advance for your help, Greg
Nice work 👏! Please give some knowledge on the tcm how it works and how to check if it's good or bad ..... thanks
Would love to cover that topic!.....when time permits.
The positive feedback is appreciated.
Thanks for dropping me a line!
My 94 Trans Am's transmission. Manufacturers don't much mention automatics suggested maintenance. Only in rear of an owner's manual,.... Always change old / burnt burnt ATF and filter man. Clean the trans pan with it's magnet too if it's equipped. Great video my fellow southpaw. Care to show the differences when adding a
shift-kit? Something about forcing more fluid causing a noticeably harder shift.
When time permits, I'd like to dedicate a video to trans maintenance. Plus, add some extra things, that could potentially extend the life of the trans. Some of the extras don't cost much (especially when compared to the cost of an overhaul).
Would love to do a video on valve-body kits!
Thanks for dropping me a line.
I appreciate your interest in this subject.
Hi Robert. Great video. Do you have any videos that explains a hard shift between the 1st and second year for the 4L60/4L80 transmissions?
We do not currently have a video that covers that topic. However, it is on the to-do list. We will be putting one together for the 4L60E...when time permits.
We're currently working our way through a build series on the TH400.
ruclips.net/p/PLMK9OC5NGhbgVgAwDO_rCGFF38T1LjkS7
90-Sec Preview of Series: ruclips.net/video/q0eciXU8YEI/видео.html
The positive feedback is appreciated.
Thanks for dropping me a line, Bryan.
Awesome! I just tripped across this video (I'll make sure to watch more) I wish it had come up in my many searches on the 4L60e. I do have a question & while I get there are soooo many different possibilities as to the cause of my problem, some of which I have already dealt with by replacing sensors. I have a K1500 Suburban with a 4L60e that appears to shift fine in the mornings but come later in the day (only short drives to & from work) the trans shifts up very early & bogs down. In fact, if you put your foot on the gas it shifts up first & not pick up revs or even shift down. It will then shift down given a little time but then it will shift straight up again. Some history, when I put 33" tyres on a couple of years ago, it started throwing a trans code on the odd occasion & reacted the same, but if I cleared the code, it came good & it sometimes wouldn't happen again for a few weeks or months. I have since gone to 35" tyres but changed the diff to a 4:56 which is pretty close to stock gearing, if anything it's probably a little the other way as the tyres only measure 34 1/2" but its certainly improved off the line, around town & is great for off road. I have replaced the TPS & MAF in this hunt. Unfortunately I don't have the Tech 2 GM OBD unit yet so I can see what the % of the throttle is, but it's odd that it seems to shift fine in the mornings, if anything, it shifts GREAT with very positive shifts as I would expect from a trans that was built with a shift kit for towing a few years ago. I am a bit suspect on a vacuum leak as I sometimes can smell fuel but I'm unsure if there are any sensors ties to the trans that would effect it, especially as I mentioned, it seems fine in the mornings. It plays up when I come home for lunch as it does after work. very odd to me with the limited knowledge I have with transmissions. More recently when I back off the gas, the revs will drop very low. I have had a stuck IAC a couple of times & am about to order a new one. P.S. The Suburban is actually Australian Delivered as R/H Drive & as a Holden, so finding a proper Tech 2 for it is proving a challenge but as I do all my own mechanical (I rebuilt a 14 bolt rear diff for it last year with a locker) & she is being built as our camping rig, we intend to keep the old girl especially as they are not very common here in Oz. I appreciate any thoughts on what could be causing the problem. Cheers!! Rod. (sorry for the essay!)
You've got a lot going on here... I've read this comment of yours twice, trying to gather info.
First and foremost, drivability (engine) problems can/will affect transmission performance. Always best to address all engine problems before chasing transmission problems. The PCM (4L60E computer) gathers info from a number of engine sensors, and it makes "decisions" based on the input received from those sensors.
Tire Size:
The PCM is constantly watching engine load (MAF, TPS, etc) and road speed (speed sensors).
Changing the tire size can affect the speed sensor info that the PCM is receiving. Because of ABS (Anti-Locking Brake) systems, many vehicle are equipped with speed sensors at each wheel. I'm not sure if this is the case with your vehicle...
Temperature:
For emissions purposes, engineers have designed the vehicles to warm up as fast as possible. When the vehicle is cold, all up-shifts are delayed. The TCC (torque converter clutch) is typically inhibited.
Doing these things raises the engine RPMS, which raises engine temp faster. However, as the engine warms up, the shifts will occur sooner.
This may explain why your engine shifts normally when cold....and shifts too soon when the engine warms up.
Once again, I'd start by addressing engine problems. If the problem still persists, I'd be leaning towards the tire size and differential mod. PCM might need to be re-programmed.
Thank you for the positive feedback!
PS - If it feels right to you, please help me spread the word about this channel.
Here's an easy way to share...
1 Handed Transmission Rebuilder: (60-Sec Preview)
ruclips.net/video/y3Vixa_Ec1E/видео.html
60-Second Preview of the video you just watched:
ruclips.net/video/fWPSaLeaOXI/видео.html
@@SouthpawAutoworks Thanks for your reply. Yes, I have been sorting through the problems with the old girl & learning heaps as I go. I'm pretty much old school so learning all the sensors etc has been a challenge but I'm enjoying figuring out what makes it tick. Now that you have mentioned the ABS, I have also done a complete brake upgrade (disc conversion on the 14 bolt rear when I built it, upgraded discs & callipers on the front plus a bigger master cylinder to suit. I am yet to sort the ABS light as I need to cycle the ABS (another reason to purchase a Tech 2) then re-bleed the brakes, though it is pulling up ok at the moment. Yes, there is ABS sensors on the front only, I wonder if that is contributing to the trans problem?? Because of the diff ratio change to suit the larger tyres, I'm not sure that is actually the problem as the gearing is close to stock but of course I can't rule it out. As far as temp is concerned, I nearly always let my truck warm up in the mornings because of the short drive, but it's odd that after it sits until lunchtime, almost straight away the early shifting happens. I wonder if it can be ambient temperature ?? it's the same when I drive home after work, if anything, I think it is worse later in the day, if that's possible?? Yes, I'm happy to share your work, helping each other is what it's all about! CHEERS!
I also enjoy learning how stuff ticks. And there's always something to learn!
When time permits, I'll be creating a video series that shows how engine problems (and other systems) can cause transmission problems.
Can you pull all of the trouble codes?
Note: If you recently reset trouble codes, drive it long enough (minutes, days, etc) to bring back all of the original codes.
@@SouthpawAutoworks No, no codes at the moment, which is why I need to get my hands on a Tech 2 for this vehicle so I can look at stuff like shift points, cycle the ABS etc. As you would know, a simple code reader just doesn't give enough info & can only clear the codes. Unfortunately I'm having trouble finding one in Australia as my truck was built for the Aust. market. The hunt is still on though.
Understood.
Wishing you the best of luck with your hunt.
This was a perfect video and incredibly helpful! Does the 1-2 shift solenoid also control the transmission shifting from 2nd gear into 3rd?
The 2-3 Shift Solenoid controls the 2-3 Shift Valve-train, which controls that upshift.
I don't have that kind of transmission but i really enjoyed it. Ur a great teacher
Glad you enjoyed it. The positive feedback is appreciated.
I have 2003 4x4 4l6oe 1 and reverse .with scaner can get 4 . Im new to tranys preasure was good a and b solinoids replaced still same no major metal in pan just fines 200000 miles on rig .your videos are great thank you any sugestions for next step
I just watched your very informative transmission video on a fl60 12 shift solenoid. The issue I'm having it will not shift into 3rd gear no check engine light, simply will not shift from 2nd to 3rd. My thoughts is I need a new 3-4 shift solenoid. Never had a transmission issue until this happened last week
Were you able to get to the bottom of this problem?
Hey thanks for sharing 👍.
Hey I'm having trouble with the loss of reverse and neutral,, only drive gears, got pan off and was wondering what would be the fault to look for?
With the shifter in Neutral, does the vehicle move forward, as though it's in gear (1st gear)?
I know this is an older post but I have watched about all of your 4L60E shift solenoid videos. I have questions if you are still around and available.I admire your strong capabilities , you know your stuff. Thanks. Micah Parris
Very kind of you.
This is the best way to reach me. Please know that I'm typically slow to respond.
@@SouthpawAutoworks I have replaced A &B solenoids. It was shifting hard into 3rd gear. Now the thing will go through all the gears but will not move reverse or forward , unless the truck temp gets to 210 or so. Then it will move forward just a bit but not reverse.
I'm a little confused by what you wrote. Lots of good info, but one thing that I'm not sure about.
You said, "Now the thing will go through all the gears but will not move reverse or forward..."
When you say this, do you mean that while the engine is idling, and the trans is in Park (and your foot is pushing on the brake), you can move the shifter through all of the different gears, and feel each gear engage (or bump)??? Or do you mean something else.
You mentioned that after the trans comes up to temp (210 F), that the truck "will move forward just a bit". When you step on the gas, is the trans slipping (engine RPMs climb, but the truck isn't moving forward as it normally would)?
@@SouthpawAutoworks oh, sorry. I can move the shifter on the column and underneath at the shifter cable.. Makes me wonder if I lost something when I replaced the A and B solenoids.
Where can I buy the solenoid and valve and spring???
Thanks Robert very informative.
I have a silverado 4l60e with a problem it selects 1st and 2nd and reverse but when in drive there is nothing.Ive connected launch x431 no fault codes. If i activate shift solenoid 2 with the launch and van runs 100% through all the gears and feels like nothing is wrong.
As soon as i turn off and restart there is no drive gear .It sounds like it is in neutral.
I pulled the pan and its sparkling clean in there so i doubt its clutch related.
Any help would be appreciated
Are there going to make any more videos on the 4L60E .I would like to see a 4L60E build video series just like you did for the TH400.Thanks for all the great videos you have made.
There are plans to finish this series on 4L60E hydraulics. And a 4L60E build series, too. Just not sure when...
Still trying to finish out the TH400 videos. So much to do, and so little time...
The positive feedback on the videos is appreciated.
Thanks for dropping me a line, highroaddrifter.
Great video! I just installed a atk rebuilt 4l60e in my 2007 silverado and 1st 3rd and 4th feel great however the 1-2 shift in light throttle sometimes i feel two bumps when it makes its shift. What could that be and could it be a part of the learning of the adapts?
So glad I found your channel, the way you present this information is the best I’ve seen yet! I have a 2005 deep pan 4L60 w/145k that loses reverse and forward after warm up and a slight buzzing noise can be heard when the gears fail. Just dropped the pan and the filter looks to be clogged (I’m assuming oil starvation). Also noted the 1-2 solenoid is very loose in its bore, while the 3-4 is nice and snug. I plan to replace the 1-2 and filter, but wondering if the 1-2 and 3-4 are the same part? They look identical and a few parts sites seem to indicate that they are. Thanks again and happy to support you!
Regarding the filter, I've encountered this before. If there's enough clutch material settled in the bottom of the pan, after the engine/trans is fired up (and warmed up) that clutch material will start circulating through the fluid/trans, and plug the filter...yes, causing oil starvation.
Cleaning the pan, and replacing the filter will take care of the issue....for now.
The clutch material came from somewhere. In other words, something may be coming apart inside the trans. Just a heads up.
The 1-2 valve-train is under load (a spring). The 2-3 valve-train has no spring. So, the 1-2 Shift Solenoid will be snug, and the 2-3 will wobble quite a bit...and this is normal.
Both the shift solenoids are the exact same part.
Glad you're enjoying the content.
Really appreciate the positive feedback.
@@SouthpawAutoworks Thanks for the lightning fast reply! OK, so I had the solenoids reversed, 3-4 is on the passenger side when trans installed, so I’m probably good with not replacing those. And yes, I’d say more debris than normal in this pan and on magnet - not terrible for first service at 145k, but the vehicle (Silverado) will now serve as a farm truck and won’t see many miles going forward. Thanks again, spectacular production quality!
Right on.
Thanks for being here.
New filter & fluid resolved the issue 👍🏽
2005 Silverado, 4.3L, 2WD
Also, 1/2” threaded steel pipe works perfect to extract filter seal.
Right on! Congrats!
Oh, cool. I'll have to give that method a go. Thanks for sharing.
Great video. My problem is going into 1st gear. My check engine light came on and my OD light started blinking. When I start out I can feel it clunk into gear. My code reads 07000 which gives me to many possibilities. No problem in any other gear. Any suggestions?
I am having trouble with the 1st to 2nd shift under moderate load. The 4L75e transmission revs up to about 4k before it shifts. Now this doesn't accelerate just revs up the to 4k before it shifts.
Any help is appreciated.
Thank you Jim
Legends like you -
Awesome!
Glad you enjoyed it.
Thanks for dropping me a line!
Great Video, looking forward to all of your videos, I do have an issue that needs explained what is happening, 2004 silverado 4l60E rebuilt about 25K miles ago, I have no codes, I have a fairly hard shift 1 to 2 and from 2 to 3 the engine revs up a bit before nicely shifting into 3rd, I was thinking the TCC Bore was leaking, but there is no code to support this, a good rebuild kit was installed with all new frictions, new sunshield, band, servo's etc... but nothing was done to the valve body as far as I know it was just reinstalled, had this issue for quite a while, I have purchased a rebuilt valve body but have not installed it yet, I am afraid it may be a bit over my head, but watching your video made me a bit more confident. and idea why it would rev anywhere from 5 to 7 hundred rpm before shifting into 3rd? Thank you Much Appreciate any answers.
Slipping during the 2-3 up-shift is typically foreshadowing of a 3-4 Clutch failure.
There are a number of potential oil leaks in the 3-4 Clutch circuit. This leakage results in lower oil pressures, which results in clutch slippage.
When time permits, I'll dedicate a video to this topic.
Those elevated RPMs are killing the life of those clutches. If this goes on for too long, the clutches will fail...resulting in a trans failure/rebuild.
Hope you can get it figured out soon.
that was as good as it gets , im learning about the 4l60e and mine lost third and fourth gear , what should i look at to fix it i want to do my own repair im keen to learn . any advise be great thank.
It sounds like the 3-4 Clutch failed. Super common problem on this trans.
There are a number of internal things that can cause that clutch to fail...as well as some things external things, too (stuff under the hood).
We plan on continuing the series on the 4L60E. More how-stuff-works, diagnosis, build videos, etc. We will dedicate a video to 3-4 Clutch pack oil circuit. After that one is done, we can then can do a video on all of the problem areas of that circuit....and cover some solutions to implement during a 4L60E build...to prevent repeat 3-4 clutch failure.
For the mean time, we're working our way through a build series on the GM TH400.
ruclips.net/p/PLMK9OC5NGhbgVgAwDO_rCGFF38T1LjkS7
@@SouthpawAutoworks thanks so much i only came across you today and im one happy camper now . good stuff thanks again .
i Really liked this video, my 1-2 shift valve is stuck inside, how can dis happend? can i just try to take it with some cleaner or something? Thanks for all.
I like how you go about it I can understand it kind of hard to keep up with the other guys on here is a 4l60 about the same as a 4l80 e
Glad it's helpful.
4L60E vs 4L80E:
They're completely different transmissions.
The 4L80E does utilizes shift solenoids and shift valves, that operate in a similar manner. However, the solenoids have a different "firing order" than the 4L60E.
@@SouthpawAutoworks I think you guys are doing a great job
Have you done a 4L80E series thank you guys are doing a great job it's helped me out a lot thank you
We have not done a 4L80E series, yet. However, we're currently working on a TH400 series.
The 4L80E is essentially a TH400, with an Overdrive section added to it.
Thank you for the kind words.
If the 1-2 solenoid malfunctions and turns off when the 2-3 solenoid is commanded on would this cause a third gear shift flare like neutral? Been having some electrical problems with my ECM I believe. The 2-3 flair followed the new transmission
Saludos! Mi transmisión 5140e no aplica el "parking" se queda en neutral. Cuál es el solenoide de "parking"?