pinion shims
If you are talking about setting the clearance on the inner and outer pinion bearings there isnt any shims,just a crush sleeve to set preload or drag on the bearings.If you are using a solid spacer and shims to set preload,then you will just have to do it with a trial and error until you get it set right. If this is what you are doing,set it up before you install the seal in the pinion housing.I hope this helps.Thanks Nick