Need info on installing new ring, pinion, & bearing set. Stock 1/2 ton family suburban, 4wd. Old parts are out new parts are ready. Book says that two washers outboard of ring gear are thrust washers but some people tell me that they are shims (I need to determine if I need different thickness ?). Also is depth of pinion set by torque on the pinion nut or by shims behind the pinion gear? I have paint to look at the pattern but how much gear contact is acceptable. Need Advice.

Harley