Prior to disassembling the assembly, measure the
runout of the ring gear. Excessive runout can be caused
by a warped gear, worn differential side bearings, warped
differential case, or particles trapped between the gear
and case. Runout is checked with a dial indicator mounted
on the carrier assembly. The plunger on the indicator
should be set at a right angle to the gear. With the dial
indicator in position and its dial set to zero, rotate
ring gear and note the highest and lowest readings, The
difference between these two readings indicates the total
runout of the ring gear. Normally, the maximum
missible runout is 0.003 to 0.004 inches (.0762 to .1016 mm).