2002 Yamaha YFM660 Grizzly factory service and repair manual, Page 274Get this manual
FRONT CONSTANT VELOCITY JOINTS AND DIFFERENTIAL GEAR
Adjusting differential gear lash 1.Remove: Shim(s) (left) Differential gear assembly Shim(s) (right) 3
2.Adjust: Gear lash Adjustment steps: Select the suitable shims using the following chartToo little gear lash Too large gear lash