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· B4U Task Force
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35,534 Posts
Thanks...Moved to 262/4.3.

You can pull the inspection cover on the trans and look up in there and see if it's leaking at the rear main.
 

· Been there Done it
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16,795 Posts
If it's black it's your rear main seal unless the oil pressure sender, intake gasket or valve cover are leaking bad enough to run down there.
If it's reddish the front seal of the trans is leaking. To repair either the trans has to be pulled and if it's the rear main the oil pan also which in a 2wd means pulling the engine.
I'd thoroughly clean the engine first to be sure it isn't one of the upper things running down. They're all easy by comparison. Hard to tell in the pic because that area is pretty oily and dirty.They're all easy by comparison.
I also can't figure out why the oil filter appears to be on the passengers side next to the transmission cooling lines.
 

· Registered
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869 Posts
If it is the real main seal and you do not want to replace it you could try switching to a high mileage oil which has seal conditioners in it. Also there is a product called AT-205 Reseal which many have good luck with, you can look into that product and it's reviews and decide for yourself.
 

· Registered
2004 Avalanche. 2001 V6 Extended Cab ZQ8.
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1,332 Posts
I also can't figure out why the oil filter appears to be on the passengers side next to the transmission cooling lines.
That's not the oil filter. It's one of those little plastic plug like things that are in the bellhousing. I think they were for the machine that carried the engine/trans around before putting them in the trucks.
 

· B4U Task Force
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35,534 Posts
That's not the oil filter. It's one of those little plastic plug like things that are in the bellhousing. I think they were for the machine that carried the engine/trans around before putting them in the trucks.
That plug provides access to the oil pan bolts hiding under there.
 
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