i had zero interest in manual transmissions until I started watching your videos. Now i want to completely rebuild my T5 for my 86 Camaro project car. I did buy your book by the way. Can't wait for it to get here.
one thing for sure, you have done many transmissions. Huget amount of knowledge. What amazes me is all the engineering that went into making this machine.
It is not easy to construct transmissions. There is a lot of engineer knowledge in it! At transmission repair it is necessary to know dei diseases and features of various gearboxes. There used to be no documents and information like now.
I love your comprehensive explanations of everything you take apart, a couple of your videos have taught me more than several years worth of reading various articles and forum posts.
Great thanks to you Paul for sharing with us how to disassemble the 4+3 Doug Nash OD. I wonder will we ever be seeing the actual assemble of the the unit? I'd love to see how you as a professional tackle this complex case!
@@GearBoxVideo Hi Paul! Would you happen to have a book or any related material available on the 4+3 Doug Nash OD you could recommend for assembling the unit?
Paul, these videos are great. I don't rebuild transmission often and I don't have any of the old Tremec T-5s or Muncie but I do like learning anything mechanical and I have been slowing going through your entire channel. Thanks for sharing all your info and experience!
Paul-- thanks so much for doing some vids on this thing. Since I was a kid I've always wondered how these worked. And, having never owned one, I had to just listen to folks TELL me about how it works, rather than SHOW me how.... BTW, you've got some really interesting vids on yer channel......good stuff.
What I find really interesting about this design is that there is no ring gear. The ratio of the planet gears to the input sun gear and output sun gear is what determines the OD ratio. You only need to hold the planet carrier stationary to engage the OD! I've never seen a planetary setup like that before, and it gives me all sorts of ideas for my own projects!
The 4 speed will fail before the OD fails.. Typically when I built them for Callaway Twin Turbos they were hit with 800HP. You can rate an OD much higher but the gear box in front of it handles the majority of the load.
These videos are very informative. I did notice that I wasn't able to find the re- assembly video. Is there any chance of that getting uploaded? Did I possibly just miss it?
Hi guy great video,s I have 30 years of building mild hot rods for my self. Now we want to rebuild a C-4 trans we have done every thing else over the years. This is all for fun. Do you know of a good video.
When will you be covering the electronics and valve body? Currently trying to diagnose a solenoid, would like to see this part in action/ how it works exactly. Heard from Brian at 5speeds in NY that it really doesn't act like a regular solenoid.
Thanks Paul you're the best ! Because of you I might tackle my top loader on my 70 Mach 1. If I fail, what's your address ? Haha keep the videos coming ! My tool boxes are slightly better organized than yours but I hear ya !
Hi Paul, my 84 corvette transmission and overdrive works fine going forward. But reverse no longer goes. It's as if the clutch is bad. Even when down shifting it seems to be just be fee wheeling? I made sure the unit was full of fluid but I'm told it needs a rebuild. Any quick fix for this? I see the rebuild kit is not available. Will you be putting together more kits? Thank you !!!
Hi Paul, first of all, thank you for your videos, without them we would not be able to understand about this fantastic trans. I have a 1985 Corvette C4 with OD switch on the console, on the highway, when the OD is engaged (light Engaged is on), if I take the foot off the accelerator pedal, I feel the OD working the RPM decreases, but at the slight touch on the accelerator the acceleration increases dramatically as if the OD had not engaged, this all happened after we opened the box to fix leaks, before it was working fine, can you help me? Thanks and greetings from Brazil.
Hey Paul, i finally got my dream car (1987 corvette) and im having an issue with the overdrive unit. when it attempts to go into od the dash light comes on but the trans doesnt shift into od (temp and speed up to spec). something is happening internally because i lose engine braking when the dash says its in od. when getting back on the throttle its acting like its in neutral until the engine rpms reach trans speed. just catching itself back up from the no engine brake issue.. i do still have reverse. i havent been able to find any info on this problem online. only thing i can see happening is that the solonoid isnt traveling fully and its taking the car out of direct and not putting enough force on the clutches to get into od. im feeling zero friction when i slowly get back on the throttle while in od so either the clutches arent compressing or theyre burned out. it has slipped a few times in the past when i was hard on the throttle and od kicked in (i swear i turned it off. i think its turning itself back on or my palm is hitting the switch while shifting) if you could give me any insight on this i would greatly appreciate it. thank you, Paul (also).
Paul, what preventive measures can you do to prevent failure? Disengage the OD or only use it in a certain way or condition? I like this transmission but uncertain of its reliability.
Just do oil changes every 10K. If the unit didn't fail by 50K then you probably have one that was assembled correctly. The OD unit is always in operation even if you are not using it
@@GearBoxVideo Thank you Paul for your response and information, I have a opportunity to purchase 88 C4 with the 4+3 . The car has 43k miles and watching your video I was worried about what you had mentioned about the OD failing.
Hi Paul, thanks again for these videos! I might need to rebuild the Super T-10 and the 4+3 OD in my 1988 Corvette, so I'm looking at hydraulic presses. Question: Is a 12 ton press sufficient to do those rebuilds?
How durable are those clutch apply bearings? Seems like very few transmission designs do that nowadays, opting instead for a rotating hydraulic piston assembly. The only modern gearbox I can think of that uses an apply bearing for a clutch pack is the new-ish GM 9-speed unit, and some transfer case clutches that use an electrically actuated ball ramp.
@@GearBoxVideo Sorry, my wording was a bit unclear. 5:34 Doesn't the (non-rotating) pressure plate press against the torrington bearing to apply pressure to the (rotating) direct clutch pack? That's the part that seems rare in gearbox designs - applying pressure through a relatively large diameter bearing.
The bearing is under load in direct. It's more commonly used as a thrust bearing in other applications but you are correct, this is a unique application.
I have the two Craftsmen set box's too🏁🌵🤙🏼✨ great show, very professional I think, just plan awesome, huge fan, great job, and keep up the amazing work edits...
I'm with ya. so many people try to tie their success to how fancy their tools and toolbox is. I have some nice tools but that's because it was what I needed to get my jobs done the rest of my tools are mismatched and even some tools I've been using since I was 12.
I've never used it and never had a reason to. I've used Mobil One multi purpose synthetic ATF in the Callaways and the Corvette Challenge cars with no issues.
@@GearBoxVideo Great information! These are my first 4+3's (I bought two - one 87 running and one 88 not running - both convertibles) and I am currently not having any noise or issues with the one that is running, but wanted to change the fluid and filter to keep it that way. I am sure one day I will need to rebuild them and your experience, knowledge and clear, concise videos are GREATLY appreciated! Looking forward to future videos and any mod tips you have to beef them up (just in case I wind up increasing HP) AND keep them running smoothly. I've been to your website and will be coming back to order the rebuild kits when the time comes (unfortunately, I had already bought the filter kits before discovering your videos and website). By the way, does that toolbox come with a pizza warmer too? ;-)
Whats the trick on removing a fill plug on my OD unit ,has not been serviced since new , its an 88 Z 52 4+3 , very dark fluid but works fine ! Thanks Know wonder Doug Nash went bankrupt ...
I just bought a 1984 Corvette and it doesn't have a motor are trans I have a super T10 I had bought a wild back and I'm putting it in the car with a 454 big block so I guess I'm just a gluing for punishment but anyway do you know if any one who would have a overdrive that I could buy for it and how heard is it to put one. On a T10 thanks
Those clutches usually burned because the sprag starts slipping and the clutch pack was never designed to fully hold in direct mode on its own. The other is the carrier bearing lets go and you loose stack height clearance on those clutches.
Now that I have my unit apart and I’ve sourced all but the updated pump cover I would love to see the assembly video, Any chances that’s coming in the near future? Thank You
I've modded them for Callaway cars as well as well as the Corvette Challenge cars that had them. They never broke or smoked with 800HP to them. However I've seen the 4 speeds actually break gears with the overdrive holding meaning the OD unit exceeded the torque capacity of the 4 speed section.
I had never heard of them until your first video. I was wondering if one of these would be an easier swap in my Bird vs shoe-horning a T56 in there, especially as I already have a ST10. I'd love an overdrive.
@@GearBoxVideo Any chance a description of these mods coming in the future (maybe in your next video)? Maybe a mod kit on you website? Thanks for your GREAT videos!
Wow what was gm thinking?! 2 transmissions to maintain and rebuild! I cant imagine there's that many people who are still working that have experience rebuilding these. Give me a 6speed anyday. Anyone know if people deleted these when they failed, or not practical im guessing? Probably easier to do a trans swap.
At the present time there were no 5 or 6 speeds available to handle the power. The ZF 6 speed didn't happen until 1989 and was developed for this application.
Hey, i have a couple questions about the doug nash overdrive unit. I have a transmission shop trying to rebuild it but they are having issues. Do you have a direct email address?
I never heard of a Doug Nash 4+3 so I had to google it .. still don't know what actual rations and number of gears it has.. My Father had a 61 Chevy Belair with a 3 on the Tree plus Borg Warner overdrive..
That carrier needs a angular contact ball bearing, good to know why these fail, I'm willing to reproduce these parts as billet pieces if you need them and have good samples
They went with an angular contact bearing and they failed just the same. You just need to set the proper stack height of the whole assembly. The people who were assembling them didn't understand the fundamentals of clearances. Therefore most failed because the bearing was being crushed
Already looked into that. Not enough room and not enough material to remove to fit a bearing. FYI. I've done quite a bit of these and developed the fixes for Callaway and the Corvette challenge series. They work fine if they are set up correctly. This is no longer something I will build simply because the expense to tool up new parts ( I've already made Iron carriers, billet pistons, washers etc) is no longer profitable since these cars have little value. Most people getting into these cheap Vettes freak out when it comes to major repairs.
@@GearBoxVideo you make the best videos! Thank you very much for sharing your knowledge. I have been afraid to try and rebuild transmissions. But with the great detail you give I’m going to give it a shot. Thanks
A pretty nifty system no less, but I’m still left wondering why wouldn’t GM have used the T5 that was in the Camaro instead. It’s a far simpler transmission, and yes I get that the torque rating for the T5 NWC wasn’t high at the time, but GM could’ve stuck with it and tweaked it like Ford did.
I guarantee you those who have request about your tools are young people who are becoming interested in automotive. Most of these young folks had no father to teach them so thankfully they have RUclips. These are just my thoughts. Young folks don't worry so much about the tools as about the wisdom you gather to perform the task. There are people out there who have a toolbox full of tools which cost more than their house, most are still renting. Tools without the ability to get the job completed is a waste. I have the same Matco toolbox I've had for over thirty years. It has a mixed variety of tools, proto, SK Wayne, Snap on, Craftsman, Mac, ect. I buy tools in pawn shops, flea markets. People who have to brag about their tools, cars, ect. Have a great character flaw, insecure in their real abilities. I grew in in my grandfather's junk yard, my father was an alcoholic, I work for myself, but notice I watch these RUclips videos. This man is a specialist in his field, gearboxes. I could feel the sarcasm in his toolbox review, just for you, especially when he gets to his lunch. I really do hope you are learning this trade to be a specialist and not just to feel special.
@@GearBoxVideo that is pretty lame and misleading. traditionally a 4 + 3 is a 4 speed with a 3 speed auxiliary. A 5 speed with a 4 speed brownie box would be a 5 and 4, but you get a lot more than 9 gears... but i guess manufactures have been lying all along, can expect them to change (or ever be honest in their advertising)
My reverse let go now I have no engine brake only if engaged in overdrive engine brake works reverse grabs a tiny bit makes noise it fully engage hard and slip . Without overdrive no engine brake
someone want to explain why they want to see what is in another persons toolbox? Other than being nosy i don't get it. oh and when the clutches hold the drum they are called "brakes" :)
I think it was me just trying to add to your defining a clutch pack. In a clutch pack when the friction plates have their teeth on the inside it's a "clutch" along with the steels. When the teeth are on the outside (so as to catch on the body of a transmission) they are called a brake, because their job is to "brake" the clutch pack when needed while a "clutch" set usually allows the clutch pack to rotate with the shaft. :) sorry if i sounded like i was being an ass. I build auto tranny's (well and race engines) and sometimes my mouth goes off before my brain kicks in and makes things more complicated than they need to be :)
Its the overdrive section of a 4+3 Transmission. Its a 4 speed gearbox that has an OD behind it. Are you familier with it? The video explains the operation and FYI the planetary is a stepped planetary unlike the slushboxes you refer to.
worst product ever put in a 'vette. Had one. First day took an off ramp "at speed".... heel/toe shifted, thing downshifted causing my rear end to try passing me on the outside!
People think by disconnecting the switch and or relay that the OD vanishes. It doesn't. The person doesn't want to eliminate OD, just have full manual control with the computer safety features still available.
Man, I wish I was smart enough not to keep my tools and materials anal-retentively organized. I probably spend three hours a week organizing, but it'd be six if things were chaotic, haha!
The 4 plus 3 set up correctly worked just fine. Although a little odd it definitely was not as smooth shifting as the ZF. However you really cannot get service parts for the ZF anymore.
Merry Christmas Paul, I’ll be calling you next week for some questions about the direct clutch stack height, I’m at .980 and it’s too tall and won’t allow the sun gear to contact the output shaft and selective washer. I’m .224 to tall, We’re to start with the height would help Thank you
I’ve mimicked both stacks heights like you recommended using 5 in the OD and 6 in the direct, When I install the direct plates in the unit there’s not enough room to stack them on the hub, Yes I’m missing a step somewhere in the assembly. I simply may not have the apply plate pulled back in the case enough but it’s 1/8 past the lip easily.
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i had zero interest in manual transmissions until I started watching your videos. Now i want to completely rebuild my T5 for my 86 Camaro project car. I did buy your book by the way. Can't wait for it to get here.
one thing for sure, you have done many transmissions. Huget amount of knowledge. What amazes me is all the engineering that went into making this machine.
It is not easy to construct transmissions. There is a lot of engineer knowledge in it! At transmission repair it is necessary to know dei diseases and features of various gearboxes.
There used to be no documents and information like now.
I love your comprehensive explanations of everything you take apart, a couple of your videos have taught me more than several years worth of reading various articles and forum posts.
Thanks for that.
Best toolbox tour ever
Your videos on the DNE overdrive are superb . I am wanting to tackle this rebuild soon. I am looking forward to the next video
Great thanks to you Paul for sharing with us how to disassemble the 4+3 Doug Nash OD. I wonder will we ever be seeing the actual assemble of the the unit? I'd love to see how you as a professional tackle this complex case!
You bet
@@GearBoxVideo Hi Paul! Would you happen to have a book or any related material available on the 4+3 Doug Nash OD you could recommend for assembling the unit?
Find a factory overhaul manual for your car on Ebay. That has all the info
Paul, these videos are great. I don't rebuild transmission often and I don't have any of the old Tremec T-5s or Muncie but I do like learning anything mechanical and I have been slowing going through your entire channel. Thanks for sharing all your info and experience!
“A clean desk is the sign of a sick mind”. Same with a toolbox.
I learn something new with every one of your videos, thanks for doing them.
Appreciate you watching.
Know nothing about that trans, but damn it's a magnificent piece of machinery when you see it apart like this
Thanks again Paul. Good video. It will help me when I rebuild the DNE transmission I have to go through. I enjoy your sense of humor.
I enjoy your videos, And feel I learn something new . Thanks for taking time out sharing , and passing along your knowledge
Paul-- thanks so much for doing some vids on this thing. Since I was a kid I've always wondered how these worked. And, having never owned one, I had to just listen to folks TELL me about how it works, rather than SHOW me how....
BTW, you've got some really interesting vids on yer channel......good stuff.
Excellent video! will be badly waiting for next part [s].
What I find really interesting about this design is that there is no ring gear. The ratio of the planet gears to the input sun gear and output sun gear is what determines the OD ratio. You only need to hold the planet carrier stationary to engage the OD! I've never seen a planetary setup like that before, and it gives me all sorts of ideas for my own projects!
Too funny "and here's my lunch"...LOL
Always enjoy your videos! Looking forward to more videos from you.
What an ingenious design and reasonably simple. How much torque can these units handle? I see gear vendors is up to 2000 hp
The 4 speed will fail before the OD fails.. Typically when I built them for Callaway Twin Turbos they were hit with 800HP. You can rate an OD much higher but the gear box in front of it handles the majority of the load.
Was the overdrive system on the Corvette compelled by the feds to reduce gas usage on cars that were considered gas guzzlers?
Yes. Thus that is why a 1983 never was put into production
GearBoxVideo thanks for the info! I understand Chevrolet used a double four barrel carb prior to the fuel injection.
Love the videos BTW!
Love the humor
Always have a good lunch in a box 👍🏼
Thank you, Paul.
These videos are very informative. I did notice that I wasn't able to find the re- assembly video. Is there any chance of that getting uploaded? Did I possibly just miss it?
Haven't had another unit or time to do one. However Im working on another core purchase
Hi guy great video,s I have 30 years of building mild hot rods for my self. Now we want to rebuild a C-4 trans we have done every thing else over the years. This is all for fun. Do you know of a good video.
When will you be covering the electronics and valve body? Currently trying to diagnose a solenoid, would like to see this part in action/ how it works exactly. Heard from Brian at 5speeds in NY that it really doesn't act like a regular solenoid.
The video is in the works. Thanks for watching
Thanks, your video breadth is amazing.
Thanks Paul you're the best ! Because of you I might tackle my top loader on my 70 Mach 1. If I fail, what's your address ? Haha keep the videos coming ! My tool boxes are slightly better organized than yours but I hear ya !
Hi Paul, my 84 corvette transmission and overdrive works fine going forward. But reverse no longer goes. It's as if the clutch is bad. Even when down shifting it seems to be just be fee wheeling? I made sure the unit was full of fluid but I'm told it needs a rebuild. Any quick fix for this? I see the rebuild kit is not available. Will you be putting together more kits? Thank you !!!
The OD is fried. Typical of a direct clutch failure in the OD. Parts will be back in stock next week
Hi Paul, first of all, thank you for your videos, without them we would not be able to understand about this fantastic trans.
I have a 1985 Corvette C4 with OD switch on the console, on the highway, when the OD is engaged (light Engaged is on), if I take the foot off the accelerator pedal, I feel the OD working the RPM decreases, but at the slight touch on the accelerator the acceleration increases dramatically as if the OD had not engaged, this all happened after we opened the box to fix leaks, before it was working fine, can you help me?
Thanks and greetings from Brazil.
Paul, can you help me?
Hey Paul, i finally got my dream car (1987 corvette) and im having an issue with the overdrive unit. when it attempts to go into od the dash light comes on but the trans doesnt shift into od (temp and speed up to spec). something is happening internally because i lose engine braking when the dash says its in od. when getting back on the throttle its acting like its in neutral until the engine rpms reach trans speed. just catching itself back up from the no engine brake issue.. i do still have reverse. i havent been able to find any info on this problem online. only thing i can see happening is that the solonoid isnt traveling fully and its taking the car out of direct and not putting enough force on the clutches to get into od. im feeling zero friction when i slowly get back on the throttle while in od so either the clutches arent compressing or theyre burned out. it has slipped a few times in the past when i was hard on the throttle and od kicked in (i swear i turned it off. i think its turning itself back on or my palm is hitting the switch while shifting) if you could give me any insight on this i would greatly appreciate it. thank you, Paul (also).
Actually direct mode clutches are smoked. Common scenario. Time to get the OD unit rebuilt
Paul, what preventive measures can you do to prevent failure? Disengage the OD or only use it in a certain way or condition? I like this transmission but uncertain of its reliability.
Just do oil changes every 10K. If the unit didn't fail by 50K then you probably have one that was assembled correctly. The OD unit is always in operation even if you are not using it
@@GearBoxVideo Thank you Paul for your response and information, I have a opportunity to purchase 88 C4 with the 4+3 . The car has 43k miles and watching your video I was worried about what you had mentioned about the OD failing.
The 88 had all the upgrades, change your oil and maintain it
A real man's toolbox.
Do have video of 4+3 overdrive assembly complete. Having trouble get plant into spray into clutches
Never did finish the video on assembly but it is scheduled in a few more months
Hi Paul, thanks again for these videos!
I might need to rebuild the Super T-10 and the 4+3 OD in my 1988 Corvette, so I'm looking at hydraulic presses. Question: Is a 12 ton press sufficient to do those rebuilds?
Best to go with a 20 ton press
@@GearBoxVideo
Thanks!
How durable are those clutch apply bearings? Seems like very few transmission designs do that nowadays, opting instead for a rotating hydraulic piston assembly.
The only modern gearbox I can think of that uses an apply bearing for a clutch pack is the new-ish GM 9-speed unit, and some transfer case clutches that use an electrically actuated ball ramp.
This is not a clutch apply bearing the bearing simply holds the planetary in place.
@@GearBoxVideo Sorry, my wording was a bit unclear.
5:34 Doesn't the (non-rotating) pressure plate press against the torrington bearing to apply pressure to the (rotating) direct clutch pack? That's the part that seems rare in gearbox designs - applying pressure through a relatively large diameter bearing.
The bearing is under load in direct. It's more commonly used as a thrust bearing in other applications but you are correct, this is a unique application.
Love your toolbox, just like mine at work. And im learning a great deal from you, so thanks alot man. From a young mechanic .... or was ... he he
Thanks for the upload and information.
How do I set the clearance for each clutch pack
Its in the upcoming assembly video, too much info to explain here
GearBoxVideo I'm looking forward to it
Assembly vid coming soon? I appreciate you sharing your knowledge.
I have the two Craftsmen set box's too🏁🌵🤙🏼✨ great show, very professional I think, just plan awesome, huge fan, great job, and keep up the amazing work edits...
Thanks for taking the time to give me feedback.
Very cool! Thanks Paul!
Did you ever make the video for the electronics of the DNE? I can’t find it?
No
That tool box review so funny.i died when I saw cable shit in there .ha
I'm with ya. so many people try to tie their success to how fancy their tools and toolbox is. I have some nice tools but that's because it was what I needed to get my jobs done the rest of my tools are mismatched and even some tools I've been using since I was 12.
Same here
Is there a part 3 video out yet?
N0
I have a 1988 corvette 4+3NASH WHAT OIL DO YOU RECOMMENDED SYNTHETIC OR CONVENTIONAL
Love your videos
I used GM synchromesh in my 88 and Royal Purple Synchromax in the OD
@@GearBoxVideo thank you for the quick response great job on your videos
Nice tool box tour, Paul. How old was that Pizza?
Great. A little greasy.
In theory would replacing the clutch packs if nothing else is burned up would give me reverse back ?
In theory yes but most of the time something else fails like the carrier bearing. That causes endplay which allows the clutches to slip
My overdrive kicks in and out rapidly during 4th... had a small engine fire could it be a faulty wire or solenoid??? Please help
You need to get a wiring diagram. Take the time to visit my page www.5speeds.com/nash.htm and www.5speeds.com/dne.htm
So what parts get replaced during the rebuild
My overdrive also goes into overdrive on its own when my car warms up is that normal? Shouldn't overdrive come on when switched on.
See and read www.5speeds.com/dne.htm all links. This is normal
Any pros or cons to using B&M Trick Shift Fluid in a1987 4+3 overdrive unit (not the transmission- only the overdrive unit)?
I've never used it and never had a reason to. I've used Mobil One multi purpose synthetic ATF in the Callaways and the Corvette Challenge cars with no issues.
@@GearBoxVideo Great information! These are my first 4+3's (I bought two - one 87 running and one 88 not running - both convertibles) and I am currently not having any noise or issues with the one that is running, but wanted to change the fluid and filter to keep it that way. I am sure one day I will need to rebuild them and your experience, knowledge and clear, concise videos are GREATLY appreciated! Looking forward to future videos and any mod tips you have to beef them up (just in case I wind up increasing HP) AND keep them running smoothly. I've been to your website and will be coming back to order the rebuild kits when the time comes (unfortunately, I had already bought the filter kits before discovering your videos and website). By the way, does that toolbox come with a pizza warmer too? ;-)
Is there a video with tips for putting it back together?
No, but I need to get another unit to to the assembly
@@GearBoxVideo I have one you can cause I’m struggling to get it back together
I need to get another unit to show assembly. These are actual jobs
Great video thanks ...
Whats the trick on removing a fill plug on my OD unit ,has not been serviced since new , its an 88 Z 52 4+3 , very dark fluid but works fine ! Thanks Know wonder Doug Nash went bankrupt ...
Is it stripped? You might have to drop the pan and heat it up with a propane torch and use an 8 point socket
@@GearBoxVideo just stuck ,torch and labor tomorrow , pan is off not much room to work ,
Nice job
I just bought a 1984 Corvette and it doesn't have a motor are trans I have a super T10 I had bought a wild back and I'm putting it in the car with a 454 big block so I guess I'm just a gluing for punishment but anyway do you know if any one who would have a overdrive that I could buy for it and how heard is it to put one. On a T10 thanks
Just get a core St10 with the OD for that year car
My overdrive automatically goes into overdrive when shifting from first to second on my 4+3 Manuel. Is something wrong.
No that is what it is supposed to do.
ya this was in my dad's 85 z51
thing was fun
Best lunchbox ive ever seen! The real gold nugget is hidden in a vault at the bunker under the garage i bet😉
Awesome! Thanks!
Like to know how to mate the two together iteka my departing rebuilt both now I forgot how the gears go to make them work together
Superb video
Thanks!
Nice! Thank you. Hope that pizza tasted better than it looked. LOL
Those clutches usually burned because the sprag starts slipping and the clutch pack was never designed to fully hold in direct mode on its own. The other is the carrier bearing lets go and you loose stack height clearance on those clutches.
Are these reliable transmissions
If built correctly yes
I need to by the overhaul kit for my 86 overdrive unit.
I stock them. Www.5speeds.com/cart
Is there a way to not have a computer? And just have an in off switch?
Yes, but most people burn the OD up because they forget to kick it out and overload it
Now that I have my unit apart and I’ve sourced all but the updated pump cover I would love to see the assembly video, Any chances that’s coming in the near future? Thank You
Next month. Super busy in the shop
Thank you Paul appreciate you’re expertise more than you know
This Transmission is much better then a T-56.
What kind of power can these units handle?
I've modded them for Callaway cars as well as well as the Corvette Challenge cars that had them. They never broke or smoked with 800HP to them. However I've seen the 4 speeds actually break gears with the overdrive holding meaning the OD unit exceeded the torque capacity of the 4 speed section.
I had never heard of them until your first video. I was wondering if one of these would be an easier swap in my Bird vs shoe-horning a T56 in there, especially as I already have a ST10. I'd love an overdrive.
@@GearBoxVideo Any chance a description of these mods coming in the future (maybe in your next video)? Maybe a mod kit on you website? Thanks for your GREAT videos!
Wow what was gm thinking?! 2 transmissions to maintain and rebuild! I cant imagine there's that many people who are still working that have experience rebuilding these. Give me a 6speed anyday. Anyone know if people deleted these when they failed, or not practical im guessing? Probably easier to do a trans swap.
At the present time there were no 5 or 6 speeds available to handle the power. The ZF 6 speed didn't happen until 1989 and was developed for this application.
@@GearBoxVideo Do you know of people doing LS v8 swaps in a ZF6 C4? Seems like a good way to bring performance of a C4 up to modern standards.
I need a selected washer to much 30 thousands end play do u have any for sale ......
Try sk Tran at 631-957-9427
Awesome thanks
Hey, i have a couple questions about the doug nash overdrive unit. I have a transmission shop trying to rebuild it but they are having issues. Do you have a direct email address?
all my contact info is in the about section and every video has my web address
My overdrive is slipping in and out. Is this a serious problem.
If the light goes on and off it's not mechanical but usually electical
I never heard of a Doug Nash 4+3 so I had to google it .. still don't know what actual rations and number of gears it has.. My Father had a 61 Chevy Belair with a 3 on the Tree plus Borg Warner overdrive..
Very interesting to see how it works. I’m going to find a competent shop I think.
Go for it!
Thank you.
Where is the video for re assembly??
Need to get a unit in
Now i see where the oil pump design on an LS came from
Gerotor pumps are standard on most automatic transmission assemblies
Thank You for this info. Looks like I'll be staying away from these even though people sell them cheap. But this is good info.
That carrier needs a angular contact ball bearing, good to know why these fail, I'm willing to reproduce these parts as billet pieces if you need them and have good samples
They went with an angular contact bearing and they failed just the same. You just need to set the proper stack height of the whole assembly. The people who were assembling them didn't understand the fundamentals of clearances. Therefore most failed because the bearing was being crushed
@@GearBoxVideo probably better to fit a tappered roller in there. If you need parts made hit me up. I've got CNC capabilities
Already looked into that. Not enough room and not enough material to remove to fit a bearing. FYI. I've done quite a bit of these and developed the fixes for Callaway and the Corvette challenge series. They work fine if they are set up correctly. This is no longer something I will build simply because the expense to tool up new parts ( I've already made Iron carriers, billet pistons, washers etc) is no longer profitable since these cars have little value. Most people getting into these cheap Vettes freak out when it comes to major repairs.
@@GearBoxVideo if you still have the prints, I like making low volume parts as a side hustle, more of a hobby.
Your tool box looks like my tool box.
Nice! Thanks
No problem!
@@GearBoxVideo you make the best videos! Thank you very much for sharing your knowledge. I have been afraid to try and rebuild transmissions. But with the great detail you give I’m going to give it a shot. Thanks
A pretty nifty system no less, but I’m still left wondering why wouldn’t GM have used the T5 that was in the Camaro instead. It’s a far simpler transmission, and yes I get that the torque rating for the T5 NWC wasn’t high at the time, but GM could’ve stuck with it and tweaked it like Ford did.
TheGtracer1994 The Ford units broke often. The T5 would have been a disaster
I guarantee you those who have request about your tools are young people who are becoming interested in automotive. Most of these young folks had no father to teach them so thankfully they have RUclips. These are just my thoughts. Young folks don't worry so much about the tools as about the wisdom you gather to perform the task. There are people out there who have a toolbox full of tools which cost more than their house, most are still renting. Tools without the ability to get the job completed is a waste. I have the same Matco toolbox I've had for over thirty years. It has a mixed variety of tools, proto, SK Wayne, Snap on, Craftsman, Mac, ect. I buy tools in pawn shops, flea markets. People who have to brag about their tools, cars, ect. Have a great character flaw, insecure in their real abilities. I grew in in my grandfather's junk yard, my father was an alcoholic, I work for myself, but notice I watch these RUclips videos. This man is a specialist in his field, gearboxes. I could feel the sarcasm in his toolbox review, just for you, especially when he gets to his lunch. I really do hope you are learning this trade to be a specialist and not just to feel special.
So if this is just an overdrive, direct box. Why is it called a 4+3. Seams like it is only a 4+2?
In front is a 4 speed. You get 4 speeds plus 3 additional ratios in 2nd , 3rd and 4th. Get it?
@@GearBoxVideo that is pretty lame and misleading. traditionally a 4 + 3 is a 4 speed with a 3 speed auxiliary. A 5 speed with a 4 speed brownie box would be a 5 and 4, but you get a lot more than 9 gears... but i guess manufactures have been lying all along, can expect them to change (or ever be honest in their advertising)
You would have to understand the marketing behind the Doing Nash product line to get it.
Can you convert it to a regular T10 4 speed if so please explain it quickley in the next video or any time you feel it good to explain.. thanks
No, the T-10 is a completely different design and approach in manual transmission architecture.
What’s in your toolbox?
Fucking everything.
Nice!
Literally a small automatic transmission. It's a great dealing. Failures are really due to neglect.
My reverse let go now I have no engine brake only if engaged in overdrive engine brake works reverse grabs a tiny bit makes noise it fully engage hard and slip . Without overdrive no engine brake
Your OD unit is smoked
@@GearBoxVideo even though overdrive works ? Thanks
I thought the four-speed would work normal and I would have no overdrive and reverse? But thanks
The OD unit doesn't disappear when not in use. So reverse mode has to drive thru clutches which when burned you will also loose engine breaking
how to change oil/filter on 4+3 manual ? every 10k service
You take the pan off and change the filter
someone want to explain why they want to see what is in another persons toolbox? Other than being nosy i don't get it.
oh and when the clutches hold the drum they are called "brakes" :)
In what context do I need the "brakes" correction?
I think it was me just trying to add to your defining a clutch pack. In a clutch pack when the friction plates have their teeth on the inside it's a "clutch" along with the steels. When the teeth are on the outside (so as to catch on the body of a transmission) they are called a brake, because their job is to "brake" the clutch pack when needed while a "clutch" set usually allows the clutch pack to rotate with the shaft. :) sorry if i sounded like i was being an ass. I build auto tranny's (well and race engines) and sometimes my mouth goes off before my brain kicks in and makes things more complicated than they need to be :)
Damn that pizza look good🤤🤤
he ate the pizza ha ha love it
I only see clutch plates , pumps and Planetaries .. I guess it a slush box not a gear transmission.
Its the overdrive section of a 4+3 Transmission. Its a 4 speed gearbox that has an OD behind it. Are you familier with it? The video explains the operation and FYI the planetary is a stepped planetary unlike the slushboxes you refer to.
16:33 Where the next part for the electricl
Like 84-85 Sensers and 86-87 Sensers
Oh fuck i just bought an 84 vette with this transmission think i will flip it tune up with some red paint buy low sell high
Gotta love pizza...😝
worst product ever put in a 'vette. Had one. First day took an off ramp "at speed".... heel/toe shifted, thing downshifted causing my rear end to try passing me on the outside!
Hypertech and Arizona Speed had chip eliminating the automatic part making in fully manual. I sold a lot of chips in the day.
Oh man! If only I had known! Of course, in retrospect, I should have known...
@@burnerjack01 could have just pulled the relay next to the brake booster to disable it. Regular 4 speed again.
People think by disconnecting the switch and or relay that the OD vanishes. It doesn't. The person doesn't want to eliminate OD, just have full manual control with the computer safety features still available.
Man, I wish I was smart enough not to keep my tools and materials anal-retentively organized. I probably spend three hours a week organizing, but it'd be six if things were chaotic, haha!
That 4+3 was the worst transmission ever made the 1989 ZF 6 speed was 1000% better.
The 4 plus 3 set up correctly worked just fine. Although a little odd it definitely was not as smooth shifting as the ZF. However you really cannot get service parts for the ZF anymore.
Merry Christmas Paul, I’ll be calling you next week for some questions about the direct clutch stack height, I’m at .980 and it’s too tall and won’t allow the sun gear to contact the output shaft and selective washer. I’m .224 to tall, We’re to start with the height would help Thank you
You just as assembling wrong.
I’ve mimicked both stacks heights like you recommended using 5 in the OD and 6 in the direct, When I install the direct plates in the unit there’s not enough room to stack them on the hub, Yes I’m missing a step somewhere in the assembly. I simply may not have the apply plate pulled back in the case enough but it’s 1/8 past the lip easily.