Chevy/GMC Duramax 01-04 LB7 Discussion of Chevy and GMC Trucks with LB7 Duramax Turbo Diesel Engines

Dmax Leaking ATF

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Old 02-11-2009, 05:30 PM
kazairl's Avatar
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Default Dmax Leaking ATF

I've got a friend of mine that has an early Dmax(I think. I really have no clue what year it is.) It is leaking ATF out of the front of the tranny. From up in the bellhousing. I'm thinking tat one of the seals on the front pump or maybe around the converter is leaking?
Anybody else have some suggestions? We are going to be pulling the tranny soon to check it out. Sounds like its going to be a PITA. But we shall see!
 
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Old 02-12-2009, 12:05 AM
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when u do pull the trans, hope this helps

https://www.dieselbombers.com/durama...r-allison.html
 
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Old 02-26-2009, 10:50 PM
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get a picture and post it up. could be a number of things..
 
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Old 03-03-2009, 03:51 PM
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it is probably one of the bolts that holds the bellhousing to the case. i cant remember exactly which one. i know it is one of the bottom. anyway it needs to have a copper washer put on it. simple fix
 
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Old 03-03-2009, 04:00 PM
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Sounds like your going to have to pull the torque converter anyway. I'd go ahead and change the front seal out, just to avoid it going later.
 
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Old 03-03-2009, 05:23 PM
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well It is fixed. Luckily I wasn't involved.

Turns out it was one of the seals around the TC. Simple fix once they got it down.
 
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