Fixing OVERDRIVE ISSUES on Your 1st Gen Cummins
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- Опубликовано: 23 авг 2024
- In this video, I discuss 4 options that you have to make sure your overdrive on your automatic (46rh) transmission works when you need it to. I do not dive into other issues that can affect overdrive such as crank position sensor, vehicle speed sensor, speedometer, and ASD relay.
Make sure to click the link below from the sponsor of this video!
Depends for Cummins ---- bit.ly/2Hfw4Qd
DNR Customs TPS delete kit: www.dnrcustoms...
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Contact Info
Email: decentgaragechannel@gmail.com
Address: PO Box 154, Payson UT, 84651
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#1stgencummins #cummins #DecentGarage
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😂😂 your the best buddy keep up the good work
Lol, just what I needed 🤣🤣
I found it’s easier on long trips as well! 👍
@@jasondblu6206 🤣🤣🤣
I can't believe I drove my 94 for 5 years when the fix was this easy. Thanks for posting.
LOL, that sponsor was unexpected. Great Video! I definitely want to do a NV4500 swap on my 92 automatic
I was planning on swapping my silver crew cab but now I have the red crew cab that's already a 5 speed.
I did the TPS delete kit for now. It is really nice how you can adjust when it shifts, right now I have it tuned for racing. It shifts around 2300 rpm if you take it easy, but if your going full send it shifts a bit earlier. My D250 was bone stock and now it has a fuel pin, governor spring, 3 turns in on the power screw, adjusted timing, and a BHAF air filter, so it makes 24psi of boost in overdrive full throttle. I don’t want to push it more than that with the automatic.
Good lord that has to be the best youtuber sponsor add I’ve ever seen!!!! I usually get super annoyed by them but that was a good laugh thanks for that.
Wow, thanks! Did you click on the link in the description? That's the best part.
@@decentgarage hahahaha I did not but now I have.... ya got me.
Tim, you read my mind. I was just fighting an OD issue, thanks for a good starting point.
Hopefully this helps!
I used the tps delete kit when it first came out 10 12 years ago. Now it’s acting up. I’m going back to a tps now. Good video.
Hopefully this helps you get your tps dialed in. I've been driving my truck quite a bit since this and the tps works flawlessly.
Man that grey 4 door is incredible! You have done an amazing job with that truck. It is sick! Oh yeah and the mountains right outside your front door are beautiful! Loved the sponsorship clip! Hahaha🤣 thanks so much for the help with this video.
Thanks man! Also, i just put out another video on an additional overdrive issue. Make sure to check that out as well.
Also if you've tried the tps, but have no speedo or odometer and have changed your speed sensor make sure the speed sensor gear is engaging on the tail shaft splines. If you look at the housing where the sensor connects to you'll notice the shaft is not centered on the housing it is offset and it has different retaining clip grooves on the housing you need to make sure A) your sensor works easy remove sensor leaving housing in the tail shaft get a drill turn key to on dont start engine and spin away if speedo works your good if not well change sensor test again if still not working you have deeper issues and need to start checking wiring and connectors or pcm is bad, B) clock housing until the gear contacts tail shaft splines and install sensor and test drive. If tps is adjusted right and speedo is working O/D should engage around 40 with part throttle if your full throttle it should hold in 3rd until you let off. I figured this out after 7hrs of tearing apart the wire harness and testing things.
This is great information! Thanks!
Any reason that I would be losing transmission fluid as a result of this problem? Transmission rebuild twice... TPS adjusted to 1.0V-3.8V... Fuel pump rebuilt...
Symptoms: Intermittent OD, works sometimes only when fluid is low... intermittent speedometer malfunction (not often)... Pulsing headlights... Transmission fluid needs topping off between 500-1500 miles depending on conditions... no burning of fluid, just evaporation.
Any insights? Thanks?
Just wanted to say thank you for all of the video's. A paperclip fix my OD issues today after adjusting the TPS didn't work. Thank you again and keep making them video's.
Thanks! That's awesome that the paperclip fixed yours too!
THANK YOU!! I have been plagued by overdrive problems since the day I bought this truck nearly 20 years ago! The "parts changers" response was just to slap a new TPS on her. Worked for a while and then went to crap again. When I put the rebuilt VE pump on, I also replaced the 3 wire harness that connects into the TPS and checked that all the wire integrity was good. Still the dam thing wont shift into overdrive until about 65mph. I rarely even drive that fast! haha. Tomorrow I am going to do exactly what you did in this vid and hope for good results. Why didnt anyone over the years I have owned this truck, EVER suggest or do this? Boggles the mind. :)
Let me know if it works
Did it work?
Thanks for the great tip. Went with the toggle switch option as there is no longer a pcm in my 1952 M37 with a 92 power train. Works great thanks again
You definitely have the best view out of all the youtubers i watch, well also off the ranch has an amazing view from his abandoned mansion.
Matt's mansion is amazing! It's awesome that he has a 1st gen now too. I wish he'd have me out to do some work to it for him. Haha
@@decentgarage that would be epic
@@decentgarage im sure you would have figured out his no starting issue in no time.
@@eulaliolopezjr I commented the solution within 5 minutes of him posting the video haha
@@decentgarage i watch you and Matt faithfully, your both great you tubers
You can do the momentary push button on a relay loop that is broken when the brake pedal is pushed. That takes the forget out of the equation for unlock but puts the remember part on the OD lockout side. Your reminder there is that it never went to OD. If there was a 3rd gear pressure port to tap in to you could make it all based on 3rd gear pressure and brake pedal.
The problem with this setup is if you are running 80 on the freeway and have to tap the brakes you'll drop out of od and rpms will sky rocket
I did option 2 and later did option 4. Both were very good options
Hey Decent Garage, fello Utah first gen owner here. Great video as always! Just wanted to add one thing with the tps senor. One issue that was causing overdrive on my truck to not engage was not that it was out of adjustment, but rather giving the wrong voltage at about 1/3rd throttle. So watch carefully with your multimeter that there are no voltage spikes.
Interesting. So what was causing the inconsistency in voltage and what did you do to fix it?
@@decentgarage the tps sensor was faulty, I was getting over 4 volts at about 1/3rd throttle to about 3/4 throttle and then it would go to 3.9 volts. I fixed it by replacing the tps sensor with an aftermarket one from autozone for about $50. Been in over a year now and still working great!
@@laynewade6700 awesome! Thanks for making me aware of that!
@@decentgarage Of course! Thanks for helping me decide on the right fuel pin!! Just ordered my THD and eagerly awaiting its arrival! Even though I'm torn on modifying the truck since it only has just over 28,000 original miles😅
@@laynewade6700 28k miles!? I kept mine stock for years to "hold its value" and then decided I wanted to enjoy. I enjoy it so much more with the mold mods I've done
Another great video! Thanks. Helped me out on my 92. Tested mine but no change in voltage so replaced it and adjusted it..took for test drive and super smooth change. Only part I am concerned with is the varying prices in TPS out there. Some were super cheap ($18 & some over $150) I ended up with a cheaper one..🤞
Yeah I'm not sure on the quality of the cheaper one vs the expensive one. I'm cheap though so I'd go with the cheaper one too haha
if you have a 91.5+, you MUST check your low temperature coolant switch located drivers side under the intake nearest the brake booster on the block.. it kills the whole loop if that sensor is bad, same as the transmission over temperature switch.
My PowerWagon gets me that excited.thanks for that remedy!
I dont know how you did that sponsor with a straight face hahaha, how many takes did you go through, great educational video by the way!
You'd be surprised. I was born for filming fake ads! 😂
Great Video, I'm happy you got the first sponsor
Us too!
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Awesome video !!
So glad you have a good sponsor. I will be purchasing some of those in case I get to drive One of my friends 1st gyns
They've come in handy many times! 🤣
Congrats on the awesome sponsorship!! Great video! Lmao!
Glad you enjoyed it
Bro I’m dieing laughing!!! The depends thing was awesome!!! Also great video I did the delete kit in my truck and had nothing but problems with it and I put my tps back in and it worked just like you did👍🏻
Yeah, I was honestly shocked when this worked in this video. But I'm glad to not have to deal with the delete kit now. I've drive. It a bit since filming this and it works flawlessly.
I watch alot of your videos plz do a video on options of hooking up overdrive on non intercooled non pcm 12v I have a 47re trans I'm putting in an trying to find a cheap effective way to make it work
I've got a video on that. I did it on a white single cab truck about a year and a half ago
Howdy, new here, just got a 92 250. She's Rough Boys ouch. body is a 0 o 10, Interior a 4 o 10. Yet, with 614,000 kms on er, the driveline is solid as F. not that many hrs on it for sure. Just watched this while cleaning a rearview to go in it and by golly if ya dont think a guy gonna bring his meter and 10mm Wrench. Its not a socket so theyre plentiful hahaha. thanks eh!
Haha thanks man!
Tim, Great info. Right before I started my conversion. I had an issue with my TPS. Luckily bought a new 1 from MOPAR. But thanks to you I'll know how to properly set it up. I am curious though. Can you do a follow-up to this vid involving passing gear. I had my trans rebuilt not to long before. But during my tear down I noticed that the trans shop had installed a spring on both ends of my passing cable. I had been having issues with since the rebuild. Thought It had been tied to the TPS. But seeing the springs kinda bothered me and I'm sure it wasn't "Factree" Curious how your trans acts now that you re-installed your TPS. Depends huh ;) That's a pretty cool sponser.........Thumbs Up !
people have no idea how to build transmissions anymore, and the springs are sometimes put there including extra spacers and nuts (nuts) to build pressure because the rebuild was as successful as a condom with holes in it..
I did the adjustment on my 91.5 this afternoon. The nut and plastic piece had to be removed and cleaned it was so tight, it couldn't be adjusted. When I got that straight, the volts at idle were 0.44!! WOT was 4.98!! So I adjusted idle to 1.00 with no problems. WOT is still at 4.98!! The transmission shifts into O/D at 40 if my foot isn't in the pedal. If I keep my foot in it, it won't shift until 60. Any speed over 40 and I let off just a bit, it goes into O/D and so far, stays there. I'm taking a longer trip this afternoon so I'll see if it stays in O/D at 70!! Any thoughts on 4.98 volts at WOT?? Thanks! ALWAYS enjoy your material and it DEPENDS on nothing but great material!! ;-)
I've had a few people ask me about the nut being stuck and not adjusting. How did you remove it to clean it?
@@decentgarage I removed the two Allen cap screws that hold the sensor to the sensor frame so the nut and plastic adjuster piece could be removed. I then took an 8mm for the bolt and 10mm for the plastic adjuster piece and s-l-o-w-l-y worked them loose being careful to not crack the plastic adjuster. Once they were loose, I removed the bolt completely, then ran it back in all the way several times until it would move easily once reassembled. I was careful to put it back with the long adjuster tab being positioned where it was when I removed it. Adjusting was much easier then. In my opinion, it seems that the reason these go out is because they do not get adjusted periodically and at WOT with volts above 3.25-3.80, the resistance builds up, they get hot, brittle and fail. Combine that with all the "wonderful" Mopar electronics... LOL. A weird perk is that now that my idle volt reading is 1.00, my lights no longer flicker at idle!! Carquest now offers the sensor with a limited lifetime warranty. TPStool.com offers a tool that hooks to the sensor and allows testing and adjustment. If I was a mechanic, I would buy it. I may just buy the generic pig-tail. Thanks for all your hard work with these videos.
Tim, you were made for commercial making 🤣
The ideas are endless at this point. Maybe I'll get so good at doing fake ads that someone will actually sponsor me 😂
That was very good information. On all of the items? LOL
Great video. I have a 2nd gen and my overdrive stop working when my rpm gauge stopped working. Any tips??
My 1993 Cummins downshifts from overdrive into 3rd gear and when it does the speedometer bounces around very erratically. In fact if it’s driving fine at highway speed and all a sudden I notice the Speedo starts bouncing around like crazy the next thing that happens is the overdrive issue. It’s like an erratic speedometer is predicting the downshift issues from overdrive into 3rd gear. I tried adjusting the TPS, but it’s still happening.
Can't get my 1993 TPS to last works great new for 200 miles then won't up shift, I've followed directions for "setting" the TPS keeps going out. Is there something in the wiring that is knocking it out? When it go's bad I put the meter on it and in all positions it reads .005 volts.
This fixed my 92 a year ago . It needed to be done again so I hooked it up and was reading
20 so adjusted it but it only reads .80 when turned as far as it will go. Any ideas.
Usually if it won't go into adjustment the tps is actually bad
Is it bad to your your truck without the OD ? Just using the 3 gears
No, you just won't be able to go very fast cause you'll hit your governed rpm
What about the courtesy light on the dash. Show me how that bracket mounts. I think I have it installed correctly because I've seen some other videos and my light hangs down out of the dash like in the video.
I've got it filmed and will have it ready monday 👍
@@decentgarage Thanks Tim.
Just picked my truck up 92 w250 and was having problems with the overdrive the dnr potentiometer was already installed and wasn’t working but I finally changed some sensors and it started working I just don’t know what speed is best for over drive
I like my overdrive to kick in between 35 and 40.
In my truck it’ll hang up going into overdrive around 45-51 mph then I have to find a sweet spot and slow down for it to shift and sometimes it’ll shift out of over drive
You should definitely try adjusting it like I did in this video. I bet it will fix it.
First of all thanks for the vids they been the best help for me fixing my first gen. I have the 3 speed trans now. But I also have the 518 ( overdrive non lockup) im going to build it up to a 47rh OD lockup. Is the TPS the only part that commands the trans to shift into OD and lockup? Or is there a computer/confuser involved with the OD and LU? Thanks again for the good vids. And have a safe Thanksgiving!
The tps only control overdrive. Lockup is controlled by the PCM. To run a 47rh in a 1st gen you either have to out lockup on a toggle switch, run a standalone controller, or go full manual valve body.
@@decentgarage so if I'm understanding this correctly.. I can put the TPS in and control OD then use the switch for lockup?
@@2eyedjack433 I believe so. Most people put them both on toggle switches or run a controller that controls them both.
@@decentgarage well thanks for the info. Im sure it will be a spring project. I still need to finish my alternator wireing. Im going to try using a relay in conjunction with the VR coming off the battery for the (signal)?... instead of the key switch. Hopefully it will eliminate the strobe effects and not kill the voltage regulator. Or atleast thats the plan. Every thing I've done so far has just made it better. Thanks for all the info bro!
My 47re is no longer shifting into overdrive. My speedometer and odometer have gone out as well. I’ve replaced the throttle position sensor and wiring as I thought that may have been causing the issue. It’s still not metering correctly, or fixed the issue. I plan on changing the vehicle speed sensor next. Any more advice or tips?
What's the difference between 3Wires and 8wires plug on transmission?
What year is the transmission you are finding an 8 wire plug on. Sounds like a 4th gen 68rfe.
First off, love the channel. So if i bump my toggle switch, or it fails while im doing 80, I would potentially grenade my tranny or engine? Because before I installed the switch, my (TPS wasnt working) unless i pinned it all the way to about 60, then it would finally shift to OD. which leads me to believe there is something else that keeps it in OD at those high speeds. Unless thats me wishful thinking. Any "safe" way for me to test this?
Thanks!
Does anyone know why my volt meter would be reading 5.06 Volts... this is when I stick the pin into the middle wire and testing it... Is my TPS bad?
Sounds like your TPS is bad.
Hey bud I tried to adjust my sensor and could never get more than a volt to go thru it .867 was the most I could get so I replaced my sensor and same thing happened I checked all my wires coming in and .967 was all that was in my wires. Could you give me any ideas on where to go from here?
What year is the truck? What other issues does the truck have? Ac? Cruise? Tach? Charging? Etc
Hey so uhh I just did all this and now my truck won’t hardly move 😑 what did I do wrong!? Gotta rev it way high to get it to barely creep. No reverse either
How much fluid did you spill out when you pulled the sensor out? Check your fluid level as instructed in your manual. I believe it's having the truck warm in neutral on flat ground but I don't recall exactly. Sounds like you could be low on fluid
I posted this on the Wrong video 🤦♂️ this was meant for ovens garage video of the transmission adjustments.
Literally been having this issue with my truck where when I get over 45 it does this thing where it almost acts like it's in neutral. I turned off my OD and problem went away
Interesting...
@@decentgarage so I tested my tps and it was way out of adjustment. Got it as close to the numbers you said and drove home. Didn't do it once. So seems the tps was the issue. At least this far
Is that only on automatic transmission?
Yes
So I did this but after one drive it would go back to like 0.750-. Does this mean my tps is bad?
Probably
Hey man I've got the newer transmission in my 93 so I just put 2 switches in it after seeing your video with the white truck. This video has made me think about something. First. Can I have the transmission hooked up and shifting all the gears and I just have 1 switch for lock up? Second question. My dad has a 93 with a brand new transmission and overdrive. The mechanic says he can't get the overdrive to work because the speedometer doesn't work and he can't find one to go in the truck. Can the speedometer not working keep it from going into overdrive? Thanks oh yeah I fixed the problem with my lights getting bright and dim. It was the ground going from the battery to the core surport. Idk about dad's it's still in the shop.
Great question. If your truck has a TPS and has a 47rh, you can definitely run overdrive off of the TPS and put lockup on a switch. The reason I ran them both on a switch on the white truck is because even after adjusting the TPS correctly it still would not shift in and out of OD.
@@decentgarage okay thanks for the help. Do you have any thoughts on my dad's truck or know where we could get a speedometer? Thanks and have a great day.
Sorry I forgot to address the question about your father's truck. A non-working speedo will 100% affect OD working or not. The speedo has to be working for OD to work correctly. However, i'm actually not sure if you can bypass that issue but putting OD on a switch and having it work despite the speedo not working.
@@decentgarage okay thanks! Yeah putting my dad's on a switch is definitely a no go. He needs something to do it itself right or a standard. Thanks again I was hoping we could do that bypass for the tps and be okay but maybe we can get a speedometer cluster.
A 518 will not stall if u leave over drive on a 47rh might because the lock up but my 518 will not it will shift to 2 before it stalls
I must have confused that with the 47rh. So if you leave it in and slow down it will downshift to second? If you speed back up does it automatically switch in to od again at some point? Seems like that would burn up the overdrive unit.
Yea if u leave the switch on it’s locked to 3 so it will go 1 2 4 definitely bad for od but it’s only happened a few times it the 2 years I’ve had it on a switch but if u slow down it will go 4 2 1 it like it don’t have 3 if u leave the switch on
Hey bro what color goes on what prong on the potentiometer?
I don't recall. There are instructions that come with the kit that should spell that out. Sorry man
My 91.5 shits to 3rd then over instantly then when slow down and turn corner don’t to kick out of od
Sounds like your lockdown and TV cables may need to be adjusted. I don't have any videos on how to do that but there are lots of writeups on it on the forums
@@decentgarage ok thanks
If mine isn't showing any volts is my TPS bad?
You should still read between 11 and 12 volts even if your TPS isn't working.
@@decentgarage Ok thanks, I don't feel like chasing wires. so I think im going to wire it up to a switch like you did on the white one! Also great job on the videos, everyone I've watched has been super helpful!
Thanks Clayton
What if it’s not showing any voltage?
So I got a question for you and want you opinion. I have a guy selling a 85 crew cab on a 93 Cummins frame that they made into a long bed. Everything is done super clean on it and it a got a newer 6spd (not a 5spd) manual in it. They completely rebuilt the motor 8k miles on it and put a smaller turbo on it for more boost. The interior was completely done also. It’s 4x4 and comes fully painted and big winch up front mounted on a custom front push guard. He’s asking 38k for you. Thoughts?
Tough call. Sounds like a sweet rig though. Depends on your budget at that point.
How do you adjust to get the 3.80 at the top end?
do you have to adjust that metal bold under the plastic nut?
Yes
@@decentgarage would love a video on this a visual would help a lot dont want to break my original throttle posistion sensor. Even if not great videos thanks for the response! BTW im only getting 2.8 at full throttle needs to be 3.8m, I am however getting the 1.0 at idle
@@decentgarage would it be clockwise or counter?
Congratulations on the sponser. The great Depends solution. I got an inside tip. Donald Trump has been wearing them for many years.
Haha
Hey bud I think I have the Same problem on mine I drive it normally with out the over drive sensor being on. And it just won’t shift out gear three? You think that might be the issue?
If you don't have working OD it will only go in to 1, 2, and 3.
What are the symptoms for this problem? I just got my transmission fixed and every time that I change gear it jumps
Definitely could be the Overdrive.
What if it only goes up to .4?
At rest? If you can't get it to 1.0 ad rest my guess would be the tps is bad
I don't have any mountains in the background but I also don't have any neighbors houses.
I have a 1990 d350 I don't have any of that stuff
Wonder how much boost they will hold.. lol..
Omg! Best comment!
Hey Decent Garage, I have a 1992 Dodge Cummins with an automatic and I am having overdrive issues. It will not shift into overdrive at all we have adjusted the TPS and are getting a low voltage reading the most voltage that we are seeing is 0.24v at full throttle and 0.12v at idle. I understand these are very low readings does this mean the TPS is garbage? Also it has a factory tachometer and is not working if these trucks came with the factory tachometer, do they need to be working in order for it to kick into overdrive? Any info helps!
Interesting. Do you have working AC. If not I would suspect that your crank position sensor is back. CPS sends a signal to the ECM to control OD, AC, and tach. You've mentioned 2/3 that aren't working.
@@decentgarage I will check out the AC tomorrow, I may also try to wire in a switch for manual overdrive and if that doesn’t fix the over drive then I know it’s likely the CPS. Is there a way to test the CPS?
@@jacobholinaty49 I don't know a great way to test the cps. Make sure it is gapped correctly. I use a debit card as a feeler gauge for the gap and it works perfect.
What if that doesn't work
Go check out my other overdrive video explaining an issue with the trans temp kick down sensor
I’d tried to adjust the sensor but all I can get is 0.40
Sounds like your tps is bad
@@decentgarage yea it was the tps. I already fix it
@@nynoperales6521 nice
Hey Tim, I'm adjusting my TPS and whenever I'm at Idle its at 1.01, then at full throttle it only goes to 2.92 , any ideas? Bad TPS? thanks in advance
Great question. I'm not sure the answer on that. Did you try driving it to see how the overdrive shift point was? I was reading last night and someone mention he sets his low point to 1.18 or so and like it better.
@@decentgarage i did, I adjusted my low point to 1.20 flat, and my full throttle is at a 3.09 or so, and it shifts into overdrive at around 50 MPH
@@solar3551 what was the shift point when you had it at 1.00?
@@decentgarage around 50mph
@@solar3551 interesting. I like mine to shift around 40. Play around with it and see if you can get it to lower
Anyone else click the sponsor link??🤦♂️🤣
That's the real treat!
On my agenda.
Man, you may have just saved me $$$$ or selling my truck
I'm glad you didn't sell it!
I hate the f" overdrive I need a better transmission
My stock auto is still doing awesome
my option was to swap it manual haha
That's a great solution haha
You shouldn’t be towing in overdrive.
This is not true. The true statement is "don't tow in overdrive under significant load based on transmission temperatures". A blanker rule of "never tow in overdrive" is not a great rule of thumb. Being able to adjust driving and what gear you are in based on EGT's and Tranny temps is what is most important.
too funny
Glad you enjoyed it 😁
The kit from PATC works really well.
Is it a tps delete kit?
@@decentgarage Yes but it has a replcement tps for diesels. It uses governor pressure to control the shift and lu.
Hows it going?
I need help! I just bought this...
'92 4x4 Auto.
TPS delete has been in the in the truck for years and PO said it works fine. My speedo stopped working and the O/D too.
I out a new VSS, hage checked pretty much everything and cant get the speedo to work. Even did the drill bypass test and nothing.
With the TPS Delete in the truck can I bypass the PCM and wire the VSS direct to the speedo and the O/D will work?
Cheers eh!
If the drill bypass didn't work I'd be leaning toward the gear in the gauge being broken. Have you checked that little plastic gear?
@@decentgarage I swapped my other speedo out of my parts truck and it doesnt work either and I know it worked.
Does anything else not work? Ac, charging, cruise control?
@@decentgarage Charging works.
Truck doesnt have AC or Cruise, its a plain janer.
@@merccrewlcab2385 so it could be your pcm but it's hard to accurately deduce that with that being the only thing not working. I'm confused why spinning with the drill didn't even work. If that didn't work it would seem the problem has to be between the gauge and the end of the cable. Some component in that chain.