Mitsubishi 3000GT Service Manual page 721

Standard tooth contact pattern
1 Narrow tooth side
2 Drive-side tooth surface (the side applying
power during forward movement)
4 Coast-side tooth surface (the side applying
power during reverse movement)
Problem
Tooth contact pattern resulting from excessive
pinion height
The drive pinion is positioned too far from the center
of the drive gear.
Tooth contact pattern resulting from insufficient
pinion height
The drive pinion is positioned too close to the center
of the drive gear.
NOTE
(1) Tooth contact pattern is a method for judging the result of the adjustment of drive pinion height and final drive
gear backlash. The adjustment of drive pinion height and final drive gear backlash should be repeated until
tooth contact patterns bear a similarity to the standard tooth contact pattern.
(2) When adjustment is not able to obtain a correct pattern, it may be judged that the drive gear and drive pinion
have exceed their usage limits and both gears should be replaced as a set.
REAR AXLE eAWD>
TSB Revision
Solution
Increase the thickness of the pinion height adjusting
shim, and position the drive pinion closer to the center of
the drive gear.
Also, for backlash adjustment, position the drive gear
farther from the drive pinion.
Decrease the thickness of the pinion height adjusting
shim, and position the drive pinion farther from the center
of the drive gear.
Also, for backlash adjustment, position the drive gear
closer to the drive pinion.
27-29