Mitsubishi 3000GT Service Manual page 720

27-28
REAR AXLE eAWD>
(2) Insert a brass rod between the differential carrier and
the differential case, and then rotate the companion flange
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 revolution torque [approximately 2.5-3.0
Nm (28-33 in.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.