GMT 800 & Older GM General Discussion 2006 & Older Trucks | General Discussion

Leaking rear seal?

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Old Aug 21, 2011 | 09:30 PM
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Default Leaking rear seal?

Does this look like the seal is leaking?




Last edited by DrX; Aug 21, 2011 at 11:21 PM.
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Old Aug 21, 2011 | 11:14 PM
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No pic?
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Old Aug 21, 2011 | 11:21 PM
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Originally Posted by budhayes3
No pic?
Thanks. Fixed it.
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Old Aug 22, 2011 | 12:05 AM
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which way does the lip of the seal face?
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Old Aug 22, 2011 | 12:38 AM
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Does that dribble smell like engine oil or transmission fluid? That should tell you right there.
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Old Aug 22, 2011 | 08:13 AM
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Originally Posted by charcold-bowtie
which way does the lip of the seal face?
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Old Aug 22, 2011 | 08:16 AM
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Originally Posted by ForcedTQ
Does that dribble smell like engine oil or transmission fluid? That should tell you right there.
The dribble feels like oil but was an orangish color???
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Old Aug 22, 2011 | 12:10 PM
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Orangish sounds like Dexcool...usually once a rear main starts leaking, it leaks quite a bit, and the flexplate/flywheel will be coated in oil, as well as the inside of the bellhousing. Are you getting puddles on the ground, and what does the fluid smell like?

*EDIT* I noticed some stains over to the left of the pic that look like your dribble mark under the rear main...any chance that you have/had a coolant leak that left a trail, maybe a head gasket or freeze plug?
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Old Aug 22, 2011 | 02:18 PM
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I cant tell by the pic. I will say when i was boosting my crankcase, after GM flipped the rear main seal design, I was gettin drips off the bolts of the bolt on inspection cover of the 80e, and that cover had a pretty good amount of oil in it. Several cc's.

I never taste fluid, but I would see if its sweet like dexcool. lol.
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Old Aug 22, 2011 | 03:25 PM
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Engine side of the flexplate is dry except the crank flange area- could be lube from the ARP bolts.

I was noticing it on the 80E dust cover as well. Just a drip, no puddles. Seemed more like oil, but maybe mixed with Dexcool. Back of the block seems dry, but I am wondering about the crossover plug on the left side from the stain.

Always seemed to be a bit of oil on the dust cover before the rebuild too. It was not orangish though. I mentioned this to the builder who said he didn't replace the seal because it looked OK.
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