After a discussion elsewhere (http://forums.aaca.org/topic/292643-maintenance/) I figured I'd share what I did to get the Limited's rear end and transmission back into shape. Last year, after considerable research, I decided to use 85W90 in both the transmission and rear end. I found a suitable GL4 oil that would work and since 90W was the recommended viscosity in the manual, I figured that was the smart choice. Shortly thereafter, I noticed that it was really tough to get the transmission into