2008 Silverado V6 Transmission Identification

[chawkmn]

Hello,

I'm new here, I tried to find the information, and could not. I have a 2008 Silverado, with the V6 engine, my transmission is losing it's 3rd gear, and it's said there are 2 transmissions, I tried to find the tag on the transmission, and couldn't. What would be the code on the build list on the glove box door, that says which transmission it is.

Clarence

[NEFisher11]

I believe you would have the 4l60e