Suzuki Samurai 1986 Service Manual page 331

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CAUTION:
When applying red lead paste to teeth, be sure to paint tooth surfaces uniformly. The paste must not
be too dry or too fluid.
16-12
Contact patterns
Diagnosis, and what to do
These contact patterns, located on toe or heel
on both drive and coast sides, mean that 1)
both pinion and gear are defective, 2) carrier
is not true and square, or 3) gear is not
properly seated on differential case. The
remedy is to replace the defective member.
Irregular patterns: If the pattern is not oval,
it means that bevel gear is defective. High or
low spots on tooth surfaces or on the seat of
bevel gear are the cause of irregular patterns
appearing on some teeth. The remedy is to
replace the pinion and-gear set and, if the seat
is defective, so is differential case.