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Leaking ATF from Allison 1000

Fluid leak after running hot

Leaking ATF from Allison 1000

Postby WrensLawnCare » Oct 28 2012, 2:01am

If it was mine, I'd check the rear seal...but with it being on the shift linkage it wouldn't make sense to be there so it's gotta be above or in front of I would think.
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Re: Leaking ATF from Allison 1000

Postby starspangled6.0 [OP] » Oct 28 2012, 2:04am

True. I'll give it a better look tomorrow.
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Re: Leaking ATF from Allison 1000

Postby benz604 » Oct 28 2012, 2:11am

the allisons up to 2006 are prone to mild leaking in colder conditions, i used to do the remote starts for a northern alberta gmc dealership, also did dodge and fords, we would get the dmax's in out of the cold and when they warmed up there would be a small drop on the floor, id say 5 out of 10 were like this and if im not mistaken gm had a fix for this, maybe only in canada tho im not sure
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Re: Leaking ATF from Allison 1000

Postby starspangled6.0 [OP] » Oct 28 2012, 2:13am

Do you know where they would leak from?
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Re: Leaking ATF from Allison 1000

Postby benz604 » Oct 28 2012, 2:16am

also if im not mistaken it had to do with an oring at the linkage
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Re: Leaking ATF from Allison 1000

Postby starspangled6.0 [OP] » Oct 28 2012, 2:20am

Huh. There does appear to be fluid coming from above the pan, and so that would explain it. How cold did it have to be? The coldest it got yesterday was in the low 30's (maybe high 20's with the windchill).
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Re: Leaking ATF from Allison 1000

Postby benz604 » Oct 28 2012, 2:27am

we would see this on brand new trucks keep in mind, so it makes sense that it could happen on a older truck thats being worked hard, id go talk to a dealer because i know for fact they had a fix in canada for this, and it looks like you have the exact same thing happening with yours.....could just be a bigger oring maybe who knows lol id say
0-minus 40f would be the range, like i said tho these were brand spanking new trucks
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Re: Leaking ATF from Allison 1000

Postby benz604 » Oct 28 2012, 3:16am

i just talked to an old friend of mine who worked at the dealership at the time and he said it was usually one of the wiring harness plugs that was the problem but sometimes it was other seals like the linkage and cooler line o rings, hope this helps you out man but im pretty sure its just gonna come down to a lil rubber oring someweres
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Re: Leaking ATF from Allison 1000

Postby starspangled6.0 [OP] » Oct 28 2012, 1:36pm

OK, thanks for the tip. The o-ring leak makes more sense then the pan gasket. I'll give it a good look-over today.
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Re: Leaking ATF from Allison 1000

Postby LGSONE » Oct 28 2012, 1:44pm

One of our work rig's did the same thing, Dealer replaced the seals on the wire harness. We were towing a bobcat for a builder friend of ours and it left a couple of drips on the floor the next day, once fixed it never did it again.

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