I am about to swap out the transmission in my 1998 4.0 2wd XJ and figured I might as well do the rear main. I see it is a 2 pieces and the oil pan has to come out, so I figure I should get everyone's favorite. Victor Reinz apparently has an improved design. I also see Felpro SKF, and Mahle. I have already read a few writeups but I figure someone has had good or bad experiences with different brands.