Rear seal replacement

I used the Fel Pro kit for mine. Have it almost complete.. I did decide to get a better gasket for the manifolds. Don't have that yet, but I ordered one from Hemi Performance (Aussie) that is a stainless/graphite. In the US, about the only other improved gasket I am aware of is Remflex.

Not sure how easy it is, but I believe you can slide the upper rear seal half out/in without disturbing the crank. If that is what you would be doing, best to wait for someone who has done it to chime in. I had mine completely apart. As much as I was not looking for all the 'extra' work, I was even less interested in doing it again....