How do you identify what transmission you have?

[Bucketoy]

Does anyone know what the difference is between a Die 1 or Die 2 DCT? How do you identify them? If you've bought a used C8 and want to confirm what DCT you have, there must be some kind of identifier on the transmission?

Correct me if I am wrong but the following would seem to be factual...

M1L Transmission and Z51 RPO (Stingray) – Vehicles equipped with M1L transmissions and Z51 models will need an additional two litres of transmission fluid added before track use. GM does not condone tracking M1L-equipped vehicles without the Z51 RPO. Transmissions will need to be identified as Die 1, Die 2 or Die 3. Is there a Die 4?

M1M and MLH Transmission (Z06 & E-Ray) – Vehicles equipped with M1M or MLH transmissions do not require a track fill with additional fluid.

Die 3 Cases – All vehicles equipped with an M1L, M1M or MLH transmission and a Die 3 case do not require a track fill with additional fluid.

A new Die 3 transmission can be easily identified by the 4 fasteners along the front edge of the sump pan. The previous Die 2 transmission has 6 fasteners along the front edge of sump pan.

 

[1st Vette]

Does anyone know what the difference is between a Die 1 or Die 2 DCT? How do you identify them? If you've bought a used C8 and want to confirm what DCT you have, there must be some kind of identifier on the transmission?

Correct me if I am wrong but the following would seem to be factual...

M1L Transmission and Z51 RPO (Stingray) – Vehicles equipped with M1L transmissions and Z51 models will need an additional two litres of transmission fluid added before track use. GM does not condone tracking M1L-equipped vehicles without the Z51 RPO. Transmissions will need to be identified as Die 1, Die 2 or Die 3. Is there a Die 4?

M1M and MLH Transmission (Z06 & E-Ray) – Vehicles equipped with M1M or MLH transmissions do not require a track fill with additional fluid.

Die 3 Cases – All vehicles equipped with an M1L, M1M or MLH transmission and a Die 3 case do not require a track fill with additional fluid.

A new Die 3 transmission can be easily identified by the 4 fasteners along the front edge of the sump pan. The previous Die 2 transmission has 6 fasteners along the front edge of sump pan.

Corvette Dual-Clutch Transmissions 101: RPO Codes M1L, M1M, and MLH — CorvetteForum

Jan 16, 2024 | 7:34 AM

apple.news

Corvette Transmission External Canister Filter and Maintenance Update, Labor Code Added – TechLink

gm-techlink.com

The C8 Corvette Stingray’s M1L transmission is undergoing a significant update, transitioning to a new Die 3 design that eliminates the need for two extra quarts of transmission fluid during track use. This change, effective late in the 2023 model year, simplifies maintenance and enhances performance by improving lubrication under high G-load conditions. The updated transmission features four fasteners on the sump pan compared to the previous six, indicating its new design. Additionally, GM has addressed issues with improperly torqued fasteners in certain 2023-2024 models, offering free transmission replacements through May 2026.

 

[Bucketoy]

I would ASSUME the difference between a Die 1 and a Die 2 DCT would be the oil pan change from a stamped steel pan with 13 bolts to a cast aluminium pan with 17 bolts, and a recessed groove for its gasket? But there must be some numbers on all the DCT somewhere confirming what they are?

 

[Murray20c8]

I have a toenail fungus and I'm supposed to ask about Ozempic.

What year is your car?

 

[1st Vette]

I would ASSUME the difference between a Die 1 and a Die 2 DCT would be the oil pan change from a stamped steel pan with 13 bolts to a cast aluminium pan with 17 bolts, and a recessed groove for its gasket? But there must be some numbers on all the DCT somewhere confirming what they are?

Look up . Post #2 .

 

[1st Vette]

I have a toenail fungus and I'm supposed to ask about Ozempic.

What year is your car?

You must have very fat toes……

 

[MKC8]

Or a diabetic exascerbated toe infection?
Hope it's just fat toes.

 

[Rruuff Day]

Remove the toe. Only cure. You likely have a set of bolt cutters....Easy peasy....

 

[Gilles27]

I believe GM published the VIN# when they updated the DCT, I'll look


Thanks to Mike Furman@Criswell, we sleuthed this out today as to when the Stingray’s DCT’s were changed during the 2023 model year. I had known it was between mid June and early-ish July but we never had precise info until Mike and I delved into this. He called one of his insider friends and learned that on June 23, 2023 was the introduction of the revised transfer case, with its among other changes, moving the internal oil pick up point to a more efficient location. This allows the SR’s going to the track effective with that revised DCT no longer needing to add in the two extra quarts of DCT fluid.

As to which exact VIN was the revised DCT introduced? It was introduced on Stingray # P5137263.

 

[Murray20c8]

Remove the toe. Only cure. You likely have a set of bolt cutters....Easy peasy....

Doctor I have a zit on my nose should I take Ozempic?
Doctor I have a wart on my butt should I take Ozempic?
Doctor I have a broken arm should I take Ozempic?
Doctor I have a nose bleed should I take Ozempic?

Anyway, so thanks to Gilles27
2020 to 2022 You do not have the upgraded pan.
2023 You might have the upgraded pan
2024 and up you do have the upgraded pan.
Hence the reason I asked for the car's year.

 

[Bucketoy]

Thank you 1st Vette, and Gilles27. All great information!

I've had more than a few people ask me how to positively identify the DCT in a C8 without ripping the car apart.

Some time ago, a prospective buyer was looking at a used 2020. He suspected the DCT had been replaced. He didn't drop the belly pan to view it from below. He did however collect numbers from placards and stampings he viewed from above. I thought his question was a fair one. Is there a way of confirming RPO and Die with information found on the DCT? It probably had a Die 1 or a Die 2 DCT in it, but it would be nice to know for sure.

A few weeks back, a 2022 had the DCT replaced. After asking the technician if it needed 2 extra litres of DCT fluid to track the car (like the original), the technician could only confirm that as far as he knows, the new ones do not need the extra track fill. The belly pan has already been installed. Curious... I took the part number for that DCT to two different GM parts counters and one would identify it as an RPO M1L. Not if it was a M1L Die 1, 2 or 3. This question seems to be popping up more and more now that the Die 3 DCT's do not require a track fill. You shouldn't have to pull the belly pan off every time you want to positively identify a DCT! There must be an identification number somewhere?

Where are all the smart people on this forum? ... lol

Sorry I missed the Car-B-Q this year Murray.

 

[HappyCamper]

Apparently they have added baffles/baffling around the fluid pickup to reduce slosh during high G maneuvers to prevent the possibility of starvation..
This effects 2023 builds on or after July 14, 2023. This VIN 1G1YB3D40P5137263 and onward

As to which exact VIN was the revised DCT introduced? It was introduced on Stingray # P5137263

 

[PapaSmurf]

Mine is VIN 5133649 looks like I missed out by about 3600 cars

 

[HappyCamper]

Mine is VIN 5133649 looks like I missed out by about 3600 cars

Really only matters if you plan to track it. (e.g. drive on a closed circuit purpose built motorsport race track facility) Otherwise you will never know the difference.

 

[Gottagofast]

Really only matters if you plan to track it. Otherwise you will never know the difference.

Don't you need a GPS to track your car?

 

[HappyCamper]

Don't you need a GPS to track your car?

Not absolutely required, but yes, you have a GPS built in it is handy with the Z51 package to create your own GPS mapped course/track maps so that you can later compare your lap times and performance data acquisition results.

If you use the GM myChevrolet application on your phone, it will provide accurate real time GPS data of were you car is located as well.

Definitely not required, but unless you want to physically remove the On Star modules you have it there anyway.

 

[Gottagofast]

Not absolutely required, but yes, you have a GPS built in it is handy with the Z51 package to create your own GPS mapped course/track maps so that you can later compare your lap times and performance data acquisition results.

If you use the GM myChevrolet application on your phone, it will provide accurate real time GPS data of were you car is located as well.

Definitely not required, but unless you want to physically remove the On Star modules you have it there anyway.

Puns

 

[Gilles27]

Really only matters if you plan to track it. (e.g. drive on a closed circuit purpose built motorsport race track facility) Otherwise you will never know the difference.

I believe it was changed for many more reasons, was reported that parking on a steep driveway was causing issues with dct fluid air lock at start up,