Thread: rear seal leaking need help

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Originally Posted by onemangang

I had the same problem as you but on my 400 chev. It turned out to be the rear main seal too. The only problem with it was the engine builder put in the wrong seal-it should have been a align hone rear main seal. Was your Chev 350 align honed? maybe that's it. This seal is just a little bigger. part #720-1962 from Jegs
I also thought it was the rear of my oil pan because it was chrome so I got the one piece fel pro "rubber like gasket" it's reusable and guarateed not to leak. Rear main seal leaks suck. I pulled my engine twice because of it. I now know that you don't have to do that. I just removed my motor mount bolts and jacked up the engine so I had just enough room to remove the oil pan. Sure beats pulling it out completley. hope this helps.

I hate to dig up such an old thread but I am having the same problem.

I have what looks like a rear main seal leak. I put a dye in the oil and used a blacklight. Looked all around the back of the engine and valve covers. The leak is coming from the back of the engine. Inside where the trans is bolted. It doesn't look like it is coming from the cam plug or oil galley bolts. I put in a Fel-Pro offset rear seal. Still leaks.

My question is the Mr. Gasket part mentioned above, Jegs 720-1962, is for a 400. I have a 350. When I look at what engines that seal fits it only says 400. However when I look at 'stock' seals the 400 and 350 use the same seals. Will the Mr. gasket seal fit a 350? I'm confused.

Bill