Transmission id help needed

[tekfire07]

Hi Everyone,
I need some help trying to understand the order code on my Tahoe.
My Tahoe is a 2009 4x4 LT.
The transmission order code is MYC, M30

This is confusing me. The MYC is the 6L80, the M30 is the 4L80 what do I have?

I am going to be pulling the transmission to repair the rear engine seal leak. I plan on replacing the torque converter while I have the transmission out. I want to make sure I am ordering the correct parts.

Thanks for any help.
Erik

 

[strutaeng]

You are saying you have BOTH codes on your glovebox sticker? Do you have a photo? Post it and blank out the VIN.

M30 is the 4L60e, not 4L80e (MT1 RPO code for that one).

This is your truck that you've driven before? You should know by heart if you have 4 speeds vs 6 speeds. At least after a few days of driving it? Did you just buy the truck?

Google says all 5.3/6.2 Tahoes that year got the 6 speeds,. Maybe the 4.8s still got the 4 speed?

Or just crawl under and take a photo and post it. The transmission can be identified simply by the fluid pan.

 

[Joseph Garcia]

Post a photo of your RPO codes sticker in your glove box.

 

[tekfire07]

Here is the photo.

 

[tekfire07]

Here is the photo.

 

[mikez71]

? I don't SEE M30 ? Only see MYC.

Does your gear selection display show 1234 or M after PRND?

 

[tekfire07]

? I don't SEE M30 ? Only see MYC.

Does your gear selection display show 1234 or M after PRND?

When I ran the vin and looked at the build sheet. The M30 was listed in the order code. Now that I looked at the sticker. I don't see it myself.

 

[Geotrash]

Here is the photo.View attachment 421035

I am 100% sure that that's a 6L80.

 

[strutaeng]

The proof is in the pudding (pudding being the photos).

 

[petethepug]

Pudding eating contest decided! 6L80 wins.