As stated, setting up gears without the special tools for measuringpinion depth generally requires a full assembly and then a check of thegear-mesh pattern to determine if the pinion depth is correct. If thepattern shows the gear mesh is off, the gears will need to be removed tochange the pinion shim. That is why the crush sleeve is not installeduntil final assembly. In final assembly of a 489 case like ours, a newcrush sleeve is positioned on the pinion, and the pinion nut is torquedto collapse the crush sleeve until the preload on the bearings resultsin a turning torque within specs. Since the crush sleeve cannot bereused, if the pinion depth is off, installing a crush sleeve on initialassembly will ruin it. It is common practice to leave it out during themock-assembly stage and simply tighten the pinion nut to reach thespecified turning torque. Once the correct shim is confirmed by thegear-mesh pattern, tear the rear down to install the crush sleeve, anddo the job all over again. To prevent the pinion from turning whiletorqueing the pinion nut, we used this homemade pinion flange holderthat bolts to the yoke.