GM and Allison question

[coolky]

I have this ongoing feud with one of my chevy buddies about what engines GM uses with the Allison transmission. He says that all 2500HDs with the 6. 0 have the allison transmission. I told him I thought the allison was only used with the duramax and the 8. 1. Can someone verify this and possibly show me some proof?

 

[10.5 Dave]

The Ally is only available with the 8. 1 and Duramax. The 6. 0 has the 4l80e.

 

[coolky]

Thank you. Do you got any links to a GM website that can verify that so I can show my buddy?