Well Im finally geting some time to put some pieces together, I hope to have the "new 2F" from the 75Fj 40 dropped into the chassis of the 70 FJ 40 this weekend. Just curious as to how difficult it would be to replace the rear main seal. I am fairly certain it leaks. I am going to replace the oil pan gasket as well but there is some dripping and such from pretty high up past the end of the oil pan itself. Thanks.