Hands down one if not the best ID video on Hydro Matic transmissions. I certainly appreciate you sir. I got a great deal of understanding and knowledge thank you.
I have a 2004 GMC K 2500 HD with the 4L80E . I bought him new , now has 626,000 miles on this original factory transmission , with service every 50,000 miles . These are outstanding, durable and reliable transmissions . Thanks again for the video.
Everything I wanted to know but were too afraid to ask. I'm curious about the internal differences to that AM General 19300175 tranny to a run of the mill 4l80e. I know you were clear about rebuilding a stock 4L80e without rollerized outputs, dual feeds, etc. You would be the perfect person to go through the approved upgrades and perhaps reference your rebuild video. You are the reason I'm rebuilding without the upgrades. I'm after longevity, but it wouldn't hurt to see what would push performance and still be approved by GM. Your attention to details make you a rare bird. Great videos regardless of not getting a million views.
Thank you. This video (well your reply to comment below actually) was the only place I could find where model codes were listed. My trans is out of an 07 express van with a duramax, but has had a gm replacement put in so the RPO code does no good. I was able to use the sticker on the transmission and your reply to a comment below to find out that the replacement trans is indeed an 07 spec 4L85E built in 2014 model code MKP. A list of all known model codes would be excellent intel to post somewhere.
I thoroughly enjoyed and learned a lot from this video. Thank you for your time and effort. Question for you, if you have time how bout a video like this for the NVG 4500 transmission. Thanks Again !
Found you video while researching 4L80E installed in two different 1995-mfg AM General M1025A2 Ground Mobility Vehicle GMV Special Forces variant of the HMMWV. I know one of my trucks has a 24203370 casting and the oil pan has a drain plug. I need to verify what is on the other 1995, as both trucks went through overhaul around 2004.
There can be exceptions, with drain plug model pans getting installed in rebuilds and such. Particularly if the work was outsourced to a civilian contractor. Information like this is not uniformly consistent in the level of detail unfortunately.
I am very thankful to you I have a question. I own a gearbox that has a 4L80E transmission trans park neutral 7+4 pin Can I replace this device with another one that has 11pin, but it is one piece? I mean, does the gearbox have no difference except for the transmisson trans?.
I have a 2009 Express 3500 6.0 and I found that there is a difference in the 4L80e that were mated to Gen4 engines because the TCM was moved to the passenger fender… I’m unclear as to if it was part of the ECM and if there are any electrical changes that need to be made if trying to install say a 2007 transmission into my 2009 express. I read online that someone had to rewire something when installing a pre-2008 transmission into their 2009 truck, but was unclear if that was correct and why. I’d love to hear your insights. I want to rebuild and upgrade a transmission for my van but I’m having trouble locating a worthwhile 2wd 08-09 4L80e in my budget but see plenty of earlier ones even up to 2007.
Model years 2004 - 2009 all use the exact same ACDelco _internal_ wiring harness and connector, both the 4L80E (RPO MT1) and the 4L85E (RPO MN8) as used on the Express 3500. There are two different valve bodies for each transmission reflecting internal differences in design, but it's the same external wiring connector on the transmission case for both of the valve body types. The control module programming I would expect to be different for each transmission type, and it's very likely the control module _external_ wiring harness for the vehicle could be different between model years.
@@DrShock thank you! great videos, I subscribed and am watching your collection on rebuilding the 4L80e. I suspect that my problem is just the torque converter, but could be other bits worn or clogged filters. I’m having slip and occasional shudder, but found that a TransGo kit(haven’t confirmed if basic kit or HD2) had been installed with the pressure bypass plate and spring valve aligned poorly, so the bypass was stuck open causing the trans to have low line pressure for who knows how long… I bought the van a few months ago. I drive it daily, drives well but feels soft at times from slippage- then it shifts very firm and would probably chirp the tires if the van wasn’t 8k lbs after the P0894 is triggered. I’m hesitant to pull the transmission to replace the converter without having the knowledge to do an in depth inspection, which your videos are greatly helping me learn. Ideally I’d like to keep driving it, pick up a transmission, Jake’s Performance stage 2 rebuild kit plus reprogramming kit, a rebuilt torque converter and then just swap the trans and converter without worrying about down time since the van is my daily driver at the moment.
I know this is probably off topic but do you know if a 4l80e out of a 1999 Chevy truck work in a 1995 Chevy truck ? I'm curious to whether the transmission being out of an OBD2 truck will work in a OBD1 truck? Thanks for any help .
There will be physical differences, such as the location and routing of the ATF cooling lines that will have to also be addressed. The 1999 had a top mounting bolt location on the bell housing that _some_ engines used, the 1995 will be missing this. For a 1995 it would be electrically compatible, but going backwards in time further and they would _not_ be compatible (pre-1994). Lots of internal differences of course, but for the 1995 truck those would all be net positive upgrades in durability and reliability.
@@DrShock ok thank you very much I've been searching for that answer for 2 days I talked to a friend of mine that's pretty good mechanically and he's the one that told me I should find out if they would be compatible with one being OBD1 and the other one being OBD2 he said that they might not work electrically I thought they probably would I just wanted some clarification thanks for taking the time to answer me I appreciate that....also did you mean the 99 would be better in terms of durability and reliability? I figured they were probably about identical inside That's good to know thanks again
The OBD specifics are going to be handled by the PCM (with the diesel engines) or the VCM (with the gasoline engines) in the GMT400 OBS style trucks. All the transmission has inside of it electronics wise are the solenoids and pressure switch, no smarts. On the outside it will have the neutral safety switch. It's possible there may be some odd or subtle glitches, so definitely read thru forum posts via google for others who have done such a modification first to be aware of them. Yes, the 1997 and up 4L80Es are going to be far more durable and reliable than the 1995 due to various upgrades internally. The most significant of which would be the change to ATF flow to the center support.
I have an early 4L80E that has the casting number welded over it however the last digits are 26-2. The cooling lines are placed together up front. It has an early pan with the rear magnet location. A 98 year stamp on the ID tag(no color). No provision for range selector beside the plug-in harness connector and no raised boss above trans pan flange beneath the Hydramatic casting. It does have the hashtag casting.. As inciteful as the video was, I still don't know what I have! Can you help?
No _known_ 4L80E case ended in those particular three digits and no case number would have included a "-". But a 1995 one would have ended in 226. Maybe you that's what you have, just obfuscated from the weld repair splatter? One of the early 1995 cases would be P/N 24202226. You can see this at time index 37:30 in the video.
Since my focus is on numbers matching factory restoration work, I would put back exactly the correct model as the truck was originally manufactured with.
Performance wise, factory stock unmodified examples will show no appreciable differences between model years. However reliability, safety, and longevity were all improved significantly though the newer you get in production year as GM engineering made revisions based on feedback from the dealer service network. Such as the relocating of the fluid routing for improved lubrication of the center support, as well as the introduction of neutral safety switches. I would say those units produced from 1997 onwards incorporate the majority of such improvements and would represent the zenith of design for this model transmission.
Thanks. No, you have to purchase GM service information at www.acdelcotds.com. GM's lawyers do a pretty good job preventing their property from being posted for free.
So that factory production metal ID tag indicates the transmission to _originally_ have been a model year 2004 (from the 04), assembled in calendar year 2004 (from the 4) on the 176th day (from the 176).
I’m not sure if I have a 4l80 or a 4l85. It’s a 2WD model with the rear parking brake drum and the the white barcode tag reads “09WBP” which is an 09 unit based on your video (rebuilt 2015 on 219th day) but not sure about the WB as it is not mentioned. Is there any way to tell 80e vs 85e without taking the internals apart?
The 4L85E was a later revision, around model year 2002 until the end in 2009 of GM production. I don't have a complete model code list for the 4L85E, but CA, CC, MP, MK, and ML are the most common. If you have the vehicle, the easiest way is the RPO sticker where a 4L80E is RPO MT1, but a 4L85E is RPO MN8.
@@DrShock I don’t have the vehicle it’s a complete pullout from a box truck. It was mated to a 2009 LY6 6.0 but I do have a tag on top of the intake stating “Engine for use in HDV’s with GVWR above 14,000 lbs. Group: 9GMXE06.0584. That’s about all the info I have on the drivetrain.
No, there are several design changes that are not interchangeable. The biggest division is 1991 thru 1996 differs significantly from 1997 thru 2009 but there can be smaller design changes within the ranges as well. You have to have access to a service manual, or some other technical documentation to insure you match the latest design part for the model year.
@@DrShock I think my main concern is if the built in emergency brake on my '95 can be swapped onto the '03 model I Purchased And do all the friction and steel clutch plates the same , I can't tell by watching all the videos. I rebuilt a '94 Dodge Caravan A/T once , it wasn't hard at all
I suspected they were a red shade when new like the earlier model Turbo-Hydramatics (red, blue, yellow, grey, green tags cycled for each model year). The seven still original 1991 4L80E's I found all had very faded tags, which looked white like you mention. I couldn't tell if that was faded from red or originally a no-color tag that first year. Thanks.
@DrShock this is a good video. I learned a lot about my transmission. That it was 1991, made in pontiac michigan, and most likely out of a 2 wheel drive truck with a vin 119080 Thanks I'll be putting it in a 1960 chevy biscayne once I update the internal wire harness. It will be hooked to 500 cadillac engine.
Hands down one if not the best ID video on Hydro Matic transmissions. I certainly appreciate you sir. I got a great deal of understanding and knowledge thank you.
I have a 2004 GMC K 2500 HD with the 4L80E . I bought him new , now has 626,000 miles on this original factory transmission , with service every 50,000 miles . These are outstanding, durable and reliable transmissions . Thanks again for the video.
Wow!! I've been looking for this info for YEARS!!!
Fantastic Contribution. Thank you for the thorough, well presented, and useful effort. Really appreciate it.
This video was exactly what I needed to ID my transmission. Thank you!
Everything I wanted to know but were too afraid to ask.
I'm curious about the internal differences to that AM General 19300175 tranny to a run of the mill 4l80e. I know you were clear about rebuilding a stock 4L80e without rollerized outputs, dual feeds, etc. You would be the perfect person to go through the approved upgrades and perhaps reference your rebuild video. You are the reason I'm rebuilding without the upgrades. I'm after longevity, but it wouldn't hurt to see what would push performance and still be approved by GM.
Your attention to details make you a rare bird. Great videos regardless of not getting a million views.
Excellent information. Thank you for your knowledge!
I have a Green tag on mine. Now I know. 13KLP 6 / 97-205 17979X
Thank you. This video (well your reply to comment below actually) was the only place I could find where model codes were listed. My trans is out of an 07 express van with a duramax, but has had a gm replacement put in so the RPO code does no good. I was able to use the sticker on the transmission and your reply to a comment below to find out that the replacement trans is indeed an 07 spec 4L85E built in 2014 model code MKP. A list of all known model codes would be excellent intel to post somewhere.
I thoroughly enjoyed and learned a lot from this video. Thank you for your time and effort. Question for you, if you have time how bout a video like this for the NVG 4500 transmission. Thanks Again !
Found you video while researching 4L80E installed in two different 1995-mfg AM General M1025A2 Ground Mobility Vehicle GMV Special Forces variant of the HMMWV. I know one of my trucks has a 24203370 casting and the oil pan has a drain plug. I need to verify what is on the other 1995, as both trucks went through overhaul around 2004.
There can be exceptions, with drain plug model pans getting installed in rebuilds and such. Particularly if the work was outsourced to a civilian contractor. Information like this is not uniformly consistent in the level of detail unfortunately.
Great information……thanks for doing this!
I am very thankful to you I have a question. I own a gearbox that has a 4L80E transmission trans park neutral 7+4 pin Can I replace this device with another one that has 11pin, but it is one piece? I mean, does the gearbox have no difference except for the transmisson trans?.
I have a 2009 Express 3500 6.0 and I found that there is a difference in the 4L80e that were mated to Gen4 engines because the TCM was moved to the passenger fender… I’m unclear as to if it was part of the ECM and if there are any electrical changes that need to be made if trying to install say a 2007 transmission into my 2009 express.
I read online that someone had to rewire something when installing a pre-2008 transmission into their 2009 truck, but was unclear if that was correct and why. I’d love to hear your insights. I want to rebuild and upgrade a transmission for my van but I’m having trouble locating a worthwhile 2wd 08-09 4L80e in my budget but see plenty of earlier ones even up to 2007.
Model years 2004 - 2009 all use the exact same ACDelco _internal_ wiring harness and connector, both the 4L80E (RPO MT1) and the 4L85E (RPO MN8) as used on the Express 3500. There are two different valve bodies for each transmission reflecting internal differences in design, but it's the same external wiring connector on the transmission case for both of the valve body types.
The control module programming I would expect to be different for each transmission type, and it's very likely the control module _external_ wiring harness for the vehicle could be different between model years.
@@DrShock thank you! great videos, I subscribed and am watching your collection on rebuilding the 4L80e. I suspect that my problem is just the torque converter, but could be other bits worn or clogged filters.
I’m having slip and occasional shudder, but found that a TransGo kit(haven’t confirmed if basic kit or HD2) had been installed with the pressure bypass plate and spring valve aligned poorly, so the bypass was stuck open causing the trans to have low line pressure for who knows how long… I bought the van a few months ago.
I drive it daily, drives well but feels soft at times from slippage- then it shifts very firm and would probably chirp the tires if the van wasn’t 8k lbs after the P0894 is triggered.
I’m hesitant to pull the transmission to replace the converter without having the knowledge to do an in depth inspection, which your videos are greatly helping me learn. Ideally I’d like to keep driving it, pick up a transmission, Jake’s Performance stage 2 rebuild kit plus reprogramming kit, a rebuilt torque converter and then just swap the trans and converter without worrying about down time since the van is my daily driver at the moment.
Very detailed, thanks for your time 👍👍👍
BTW, also, if one day you have the Time to talk about the 6.5 history, i’ll book a vacation day and Watch it with popcorn ❤️
Great Video!
I know this is probably off topic but do you know if a 4l80e out of a 1999 Chevy truck work in a 1995 Chevy truck ? I'm curious to whether the transmission being out of an OBD2 truck will work in a OBD1 truck? Thanks for any help .
There will be physical differences, such as the location and routing of the ATF cooling lines that will have to also be addressed. The 1999 had a top mounting bolt location on the bell housing that _some_ engines used, the 1995 will be missing this. For a 1995 it would be electrically compatible, but going backwards in time further and they would _not_ be compatible (pre-1994). Lots of internal differences of course, but for the 1995 truck those would all be net positive upgrades in durability and reliability.
@@DrShock ok thank you very much I've been searching for that answer for 2 days I talked to a friend of mine that's pretty good mechanically and he's the one that told me I should find out if they would be compatible with one being OBD1 and the other one being OBD2 he said that they might not work electrically I thought they probably would I just wanted some clarification thanks for taking the time to answer me I appreciate that....also did you mean the 99 would be better in terms of durability and reliability? I figured they were probably about identical inside That's good to know thanks again
The OBD specifics are going to be handled by the PCM (with the diesel engines) or the VCM (with the gasoline engines) in the GMT400 OBS style trucks. All the transmission has inside of it electronics wise are the solenoids and pressure switch, no smarts. On the outside it will have the neutral safety switch. It's possible there may be some odd or subtle glitches, so definitely read thru forum posts via google for others who have done such a modification first to be aware of them.
Yes, the 1997 and up 4L80Es are going to be far more durable and reliable than the 1995 due to various upgrades internally. The most significant of which would be the change to ATF flow to the center support.
I have an early 4L80E that has the casting number welded over it however the last digits are 26-2. The cooling lines are placed together up front. It has an early pan with the rear magnet location. A 98 year stamp on the ID tag(no color). No provision for range selector beside the plug-in harness connector and no raised boss above trans pan flange beneath the Hydramatic casting. It does have the hashtag casting.. As inciteful as the video was, I still don't know what I have! Can you help?
No _known_ 4L80E case ended in those particular three digits and no case number would have included a "-". But a 1995 one would have ended in 226. Maybe you that's what you have, just obfuscated from the weld repair splatter? One of the early 1995 cases would be P/N 24202226. You can see this at time index 37:30 in the video.
Thanks for the information very interesting
What is your favorite model to use? Front lube or rear lube?
Since my focus is on numbers matching factory restoration work, I would put back exactly the correct model as the truck was originally manufactured with.
@@DrShock as far as performance? Front or rear is optimal?
Performance wise, factory stock unmodified examples will show no appreciable differences between model years. However reliability, safety, and longevity were all improved significantly though the newer you get in production year as GM engineering made revisions based on feedback from the dealer service network. Such as the relocating of the fluid routing for improved lubrication of the center support, as well as the introduction of neutral safety switches. I would say those units produced from 1997 onwards incorporate the majority of such improvements and would represent the zenith of design for this model transmission.
@@DrShock thank you sir
Got one with yellow tag has two 2002 trans PP on yellow tag has the brake drum in back. What does the PP mean?
They all have three letters (ending in a letter "P", so there should be another letter on the far left side of the tag.
Thank you very much and appreciation Mr for this detailed video. Can we find this book on Google with a pdf file?
Thanks. No, you have to purchase GM service information at www.acdelcotds.com. GM's lawyers do a pretty good job preventing their property from being posted for free.
Sir, my hat off to you and your information! I’ve gotten some
“good” information from other channels, but you are top shelf 🫡
I have a yellow tag with MJ P but a stamp of 04 4 176 so is it an 04 or 05. I bought it as a 05 from a 6.0
So that factory production metal ID tag indicates the transmission to _originally_ have been a model year 2004 (from the 04), assembled in calendar year 2004 (from the 4) on the 176th day (from the 176).
My transmission was built 13 days before yours. MJP 04 4 163.
I’m not sure if I have a 4l80 or a 4l85. It’s a 2WD model with the rear parking brake drum and the the white barcode tag reads “09WBP” which is an 09 unit based on your video (rebuilt 2015 on 219th day) but not sure about the WB as it is not mentioned. Is there any way to tell 80e vs 85e without taking the internals apart?
The 4L85E was a later revision, around model year 2002 until the end in 2009 of GM production. I don't have a complete model code list for the 4L85E, but CA, CC, MP, MK, and ML are the most common. If you have the vehicle, the easiest way is the RPO sticker where a 4L80E is RPO MT1, but a 4L85E is RPO MN8.
@@DrShock I don’t have the vehicle it’s a complete pullout from a box truck. It was mated to a 2009 LY6 6.0 but I do have a tag on top of the intake stating “Engine for use in HDV’s with GVWR above 14,000 lbs. Group: 9GMXE06.0584. That’s about all the info I have on the drivetrain.
Ar all 4l,80 internal components interchangable
No, there are several design changes that are not interchangeable. The biggest division is 1991 thru 1996 differs significantly from 1997 thru 2009 but there can be smaller design changes within the ranges as well. You have to have access to a service manual, or some other technical documentation to insure you match the latest design part for the model year.
@@DrShock I think my main concern is if the built in emergency brake on my '95 can be swapped onto the '03 model I Purchased
And do all the friction and steel clutch plates the same , I can't tell by watching all the videos. I rebuilt a '94 Dodge Caravan A/T once , it wasn't hard at all
I have a 1991 with a white tag 91 BAP- 6672
I suspected they were a red shade when new like the earlier model Turbo-Hydramatics (red, blue, yellow, grey, green tags cycled for each model year). The seven still original 1991 4L80E's I found all had very faded tags, which looked white like you mention. I couldn't tell if that was faded from red or originally a no-color tag that first year. Thanks.
@DrShock this is a good video. I learned a lot about my transmission. That it was 1991, made in pontiac michigan, and most likely out of a 2 wheel drive truck with a vin 119080
Thanks
I'll be putting it in a 1960 chevy biscayne once I update the internal wire harness. It will be hooked to 500 cadillac engine.
You sound just like the original guy on the 1970's show, let's make a deal