Which tranny do I have?

[07 Denali]

How can I find out which tranny I have? Glove box codes? It's a 2007 Yukon Denali.
Thanks!

 

[ccapehartusarmyINF.(ret)]

if you have the 6 liter its a 4L65E if you have the 6.2 liter its a 6L80

 

[07 Denali]

Thank you. It's the 6.2l engine. Sounds like the 6L80 is one of the better trannies that GM has made.