all the ring and pinion shops tell me to use a 20,000th shim for the pinion depth. i tried that and checked the pattern, way off. the best i have been able to come up with is at 6,000th shim..the 20 leaves the pattern way out on the face of the tooth but centered toe to heel,,the 6,000th is centered pretty good face and flank, but its way to the toe or inside and the coast doesnt change much..could they be wrong or is it me??what size shim did anyone else use??? 14 bolt 10.5 ring gear 5.13 thick gear......help..