What diff? 07 Duramax / Allison

[sope]

I'm at work here and we have a couple of these trucks. The diff is the general shape of a 14 bolt, looks a little bigger, has 14 bolts, no Dana stamp, has a fill plog on the cover but none on the housing and has more reinforcement on the housing than an old 10.5" 14 bolt. Could it be a 11.5 " 14 bolt? We found the ratio from the RPO code but not the model. We need to know for our records. Any body know?

 

[badger red]

Pretty sure it would be the 11.5 14 bolt--seems that anything with a Duramax has that bigger axle.

Jeff

 

[sope]

Just wasn't sure there was such a thing. I checked All Data and there is an 11.5" diff listed just didn't say what it is. Anybody else confirm this?

 

[sope]

Well I got home and started searching. Found that it is an AA&M (American Axle and Manufacturing) 11.5" 14 bolt. Dodges and Chevs use them in newer HD models. I don't see it called a Corporate axle. I do still have a question. Did AA&M make the Corporate for GM or are they made by GM.

 

[dremu]

Well I got home and started searching. Found that it is an AA&M (American Axle and Manufacturing) 11.5" 14 bolt. Dodges and Chevs use them in newer HD models. I don't see it called a Corporate axle. I do still have a question. Did AA&M make the Corporate for GM or are they made by GM.

IIRC, AA&M was spun off by GM ... but yeah, that's the same one. The one you're looking at is the 11.5" version of our venerable (10.5") 14BFF.

-- A

 

[roadnotca]

Lots of good tech info on the new trucks, at "TheDieselPlace".

 

[1979jimmy350]

Well I got home and started searching. Found that it is an AA&M (American Axle and Manufacturing) 11.5" 14 bolt. Dodges and Chevs use them in newer HD models. I don't see it called a Corporate axle. I do still have a question. Did AA&M make the Corporate for GM or are they made by GM.

AAM basicly bought all the old GM axle and Driveline plants in 94 and has been making GM's axles for them. I actually work for AAM in product engineering on the 11.5 axle and drivelines so any questions you have on it im sure i can answer it in depth for you

 

[sope]

Thanks for the info guys. I'm a mechanic and work for a large fleet and when the trucks come in for their first service we collect all the specs, including diff type and gear ratio. I saw this and was stumped.

 

[roadnotca]

Thanks for the info guys. I'm a mechanic and work for a large fleet and when the trucks come in for their first service we collect all the specs, including diff type and gear ratio. I saw this and was stumped.

Cool avatar.