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Jerry, Master Mechanic
Category: GM
Satisfied Customers: 17220
Experience:  ASE Master tech, 30 years experience GM certified
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rear seal oil leak on 2001 yukon

Customer Question

rear seal oil leak on 2001 yukon
Submitted: 7 years ago.
Category: GM
Expert:  Jerry replied 7 years ago.

Hello and welcome to Just, Super mechanic here. About your vehicle.


Did you need the instructions for the rear main seal?


Do you know the engine size?

Customer: replied 7 years ago.
Engine 1500 V8 5.2 L
I was told if it is the rear seal the entire transmission has to come out to repair. Estimate for that work is >$700
Expert:  Jerry replied 7 years ago.

Yes, unfortunatly the labor for the trans is about 7.4 hours, with an extra hour for the seal. Whereas the national average rate is about $75 per hour. Then there is the cost of the seal, abour $25 plus oil and filter, taxes and "shop fees".



Customer: replied 7 years ago.
If it is a rear seal where should the oil be leaking?
Expert:  Jerry replied 7 years ago.

It will normally go to the lowest point, (which seems to be the oil pan on that engine) about the middle of it in the rear.




Customer: replied 7 years ago. does that require taking the transmission out to repair? If fixed will it come back? Someone told me they always return.

And is there any quick fix?
Expert:  Jerry replied 7 years ago.

Yes the trans has to come out to do the rear main seal.


If there are no problems with the crankshaft and the seal is installed correctly, there should not be any reasons for it to leak in the near future.


The only quick fix I know of would be some oil leak stopper, which normally swells the seals, but will eventually make them hard, and they need to be replaced anyhow.