There are two setup procedures, same as a 9" Ford axle that was used in NASCAR for many years. Use whatever pinion bearing shims are necessary to get the bearing preload correct- - - - -THEN set the pinion depth and tooth contact pattern by using shims between the pinion carrier and the housing- - - -NOT gaskets that can compress and upset the tooth contact. Using the same shim pack that came out is a mistake- - - -you'll need to compensate for whatever manufacturing tolerances the new pinion bearings might have by changing shims until you get the right preload.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!