440 REAR MAIN SEAL FIXED!!!!!!!!

I just wanted to post how well the Fastfishautoparts.com one piece rear main seal works. I have been wrestling with repairing rear main seal leaks ever since completion of my build last year. I ve used the two piece rubber design from Mopar and yes, they work well if everything is perfect!! The problem resides with the factory design and use of a loose fitting rear main seal retainer. I learned a couple of things which really help while installing it. The first thing is to mock up your retainer block and make sure the seal grooves line up and are concentric where the retainer meets the block. Fit your retainers bolts and make sure there is no contact from the bolt head or flange against the machined holes in the retainer itself. This will shift the retainer out of position as it did on my brand new 440 source piece. Going to return that piece of trash as soon as I can! Use a set of feeler gauges with equal spacing on each side of your retainer between the retainer and block to eliminate any twisting of the retainer as you torque the bolts. Many failures have occurred as a result of one or both halves of the two piece seal twisting/rotating slightly in the seal grooves as the retainer twists slightly out of position as it is tightened into position.
The Fastfish one piece rear main seal is expensive and yes, it works extremely well. It comes with excellent instructions. Combined with the above information and use of their seal, I have a bone dry rear main and have driven the car 200 miles in our lovely 110 degree Arizona heat. Several brutal heat cycles and not one drop of oil! I highly recommend their product despite the price tag. Worth every penny in my opinion!