TRNW-2: Allison housing

[Justin Merritt]

I’ve done it once, it was a pain. Now I pull the trans to replace them. Let the customer pay for the repair, don’t short change yourself. Not worth the headache lol. 

Justin 
Sent from my iPhone

> On Dec 18, 2025, at 6:11 PM, Jim Bockus via trnw2 <trnw2 at trnw.net> wrote:
> 
> 
> I've done it a few times, you only get one chance to hold the mainshaft in position, otherwise you're going to have to pull it and disassemble it to get the bearings back into place. It's really not that hard to do. Better repair or replace the rear drive shaft which is likely the cause of the breakage. 
> 
> On Dec 18, 2025 6:02 PM, Phil Materi via trnw2 <trnw2 at trnw.net> wrote:
> Yes it can be replaced in the truck, but make sure to hold the output shaft in tight so that none of the bearings fall out of place.  If they do, you can disassemble the entire back half of the transmission in the vehicle and glue everything back in place with trans gel.  Be careful of the park lever and tiny spring, as well as be ready for some weight if the output planet comes out with the housing.
> 
> Phil Materi
> A&B Transmissions
> Langley, B.C.
> From: trnw2-bounces at trnw.net <trnw2-bounces at trnw.net> on behalf of Brett Karulak via trnw2 <trnw2 at trnw.net>
> Sent: December 18, 2025 3:54 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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