the shimming is pretty dang easy..just undo the two bolts holding the carrier bearing to the frame crossmember.....put the shims in, and bolt it back up. If by chance you "run out of bolt"...which ive only seen on lifted trucks.....you would also need to get a longer boldt with the same thread and pitch to use the same J nut.....but i doubt youll need to shim more than a half inch...