Chrysler Conquest 1988 Service Manual page 1053

REAR AXLE
- Differential Carrier
3-35
B rass rod
llS67t
FiNAL DRIVE GEAR TOOTH CoNTACT
Check the final drive gear tooth contact as follows:
(1) Apply a thin, uniform coat of machine blue to both surfaces
of the drive gear teeth.
(2) Insert a brass rod between the differential carrier and the
differential case, and then rotate the spline coupling by
hand (once in the normal direction, and then once in the
reverse direction) while applying a load to the drive gear so
that the rotating torque [approximately 2.5 to 3.0 Nm (1.8 to
2.2 ft.lbs.)] is applied to the drive pinion.
Caution
If the drive gear is rotated too much, the tooth contact
pattern will become unclear and difficult to check.
(3) Check the tooth contact condition of the drive gear and
drive pinion.
NOTE
Checking the tooth contact pattern is the way to confirm
that the adjustments of the pinion height and backlash have
been done properly. Continue to adjust the pinion height
and backlash until the tooth contact pattern resembles the
standard pattern.
If, after adjustments have been made, the correct tooth
contact pattern cannot be obtained, it means that the drive
gear and the drive pinion have become worn beyond the
allowable limit; replace the gear set.
Caution
If either the drive gear or the drive pinion is to be
replaced, be sure to replace both gears as a set.