Ok, question.....I cant' really afford to have my gears installed right now, but a lot of guys have been telling me how easy it is, as long as I get the right number of shims and the bearing installed. Well I bought some used FMS 3.73 that have about 600 miles on them, and since they are used out of a similar year mustang with an 8.8, the pinion already has the bearing and shims installed. A friend of mine who has done this in a mustang before said to re-use the crush sleeve and install the pinion and ring gear since it was formally installed in the same rearend anyways. I've heard of people using .030" shims as a standard when installing FMS 3.73 gears....Any comments on this?? So if my used pinion DOES in fact have a .030" shim already installed, and the bearing is already on there, its just a really simple swap, right??