I fit sump on my 3.8 yesterday and am a bit concerned about the rear seal. My block was done up with a rear main seal conversion and I think the channel for the seal is a bit deeper than stock. With the original rear housing there was a nice crunch on the standard cork gasket, but with this one the sump just kind of sits on the cork without much compression. It seems like a leak waiting to happen.
I’m thinking it would be smart to replace it with something 1/8" thicker so it gets a good smoosh. But I’m not sure what the stock cork is and am not near the car. Am I correct that it’s 1/4"? I did some searching for 3/8’ cork, and unfortunately it looks like it’s going to be pretty spendy since it’s not sold in small quantities.