TRNW-2: Allison housing

[Fred Whitaker]

  I have done it a couple times. It's been years ago,but I don't remember it being that hard to do. As was said figure out a way to hold the output shaft in place.   U joints are almost always the reason for cracks like this.
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From: trnw2-bounces at trnw.net <trnw2-bounces at trnw.net> on behalf of Brett Karulak via trnw2 <trnw2 at trnw.net>
Sent: Thursday, December 18, 2025 5:54 PM
To: Technical Discussion Forum <trnw2 at trnw.net>
Subject: TRNW-2: Allison housing

I have a 2007 4wd Duramax, the extension housing is cracked and leaking.  Can you replace this in the truck?  I think too much stuff will drop out and make it difficult to go back together.  I was under the assumption the housing has to be replaced with the unit out of the truck.  If anyone has ever done it in the truck, please let me know.

Thank you,
Brett Karulak
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