Thrust Block Selection

If cam gear and/or side gear have been replaced, or if it is necessary to replace thrust block and original dimension cannot be determined, use the following procedure during differential case assembling to determine proper thrust block dimension.
1. Install cam gear and side gear assemblies in respective positions in case, insert differential pinion shaft through case bores and secure with lock screw.
2. Wedge large tapered screwdrivers or equivalent tools between cam gear and pinion shaft and side gear and pinion shaft to seat gears in case.

Fig. 10 Side Gear Spread Inspection.:

3. Using suitable gauge, measure distance between face of cam gear and face of side gear, Fig. 10, and record reading. Ensure gauge ends rest on gear faces, not gear teeth when measuring side gear spread.
4. Measure thickness of original thrust block at outer corner and record dimension.
5. Select thrust block with thickness zero to 0.006 inch less than side gear spread measured in step 3. If original thrust block is serviceable, but does not provide the specified zero to 0.006 inch clearance, RH side gear can be shimmed to provide proper thrust block clearance as long as side gear backlash is maintained within the specified 0.002-0.010 inch.