Shim Selection

Cam Gear Shim Selection
If cam gear is replaced, or if original cam gear shim thickness cannot be determined, shim must be selected to maintain proper backlash with differential pinions using following procedure.
1. Install disc pack guide clips, then mount cam gear assembly in differential case using original shim.
2. Install differential pinions and thrust washers in installed position in case, then insert pinion shaft and retain shaft with lock screw. If pinion shaft cannot be inserted, replace cam gear shim with one of less thickness.
3. Index one tooth of pinion closest to lockscrew so that it points downward, perpendicular to case flange.
4. Wedge large screwdriver or similar tool between pinion shaft and face of cam gear to compress gear assembly into case.
5. Mount suitable dial indicator on case with plunger button bearing against pinion tooth indexed in step 3, Fig. 7.
6. Pull pinion gear against case, rotate pinion back and forth against cam gear and read backlash from indicator.
7. Repeat steps 3 through 6 with remaining differential pinion.
8. Select a cam gear shim which will provide .010-.018 backlash between cam gear and differential pinions. When cam gear and/or shim is replaced, thrust block must be measured and selected to maintain proper clearance during assembly.



Side Gear (R.H.) Shim Selection
If side gear is replaced, or if original shim thickness cannot be determined, select proper side gear shim thickness by measuring backlash between side gear and differential pinions. Follow procedure outlined for ``Cam Gear Shim Selection,'' using fully assembled side gear properly installed in case. Select a shim that will provide .002-.010 inch backlash between side gear and differential pinions. If side gear and/or shim is replaced, refer to ``Thrust Block Selection'' during case assembly in order to install thrust block that will maintain proper assembly clearances.