I seem to be getting an oil leak that has covered the oil pan, scatter shield, bellhousing, transmission, and mount... I had my engine rebuilt in 2001 and it can't have more than 30,000 miles on it. Is this my rear main? If so, is it possible to replace it while in the car or do I have to pull the engine? Are these older 289's able to accept a 1 piece rear main seal or only 2 piece?

I am not 100% that this is even coming from my rear main but it's seems probable. Does this sound like a rear main issue or are there other possible causes?

I cleaned it all off today so I will check it in the next few days to track where it is coming from.

1966 Mustang
289 4v
Manual T5 and Bellhousing

 

Start from the top then go down. I have oil all over those parts mentioned but it was the back of my manifold that was leaking.

 

agree, you need to clean everything off then find out where its leaking.

 

I did clean it off and I am waiting to see where it comes from but in case it is the rear main... does anyone have any experience with replacing these and can help me.