Gear Tooth Contact Pattern Check - GMC chervolet camaro 1999 Service Manual

Driveline/ Axle
Gear Tooth Contact Pattern Check
Tools Required
J
39446 ABS Exciter Ring Protector Kit
Notice:
It is very important that tooth contact be
tested after the differential is taken apart. Variations in
the differential or differential drive pinion gear inner
bearing may cause the differential drive pinion gear to
be too far away from, or close to, the differential
ring gear. Therefore, the tooth contact pattern must be
tested and corrected, (if necessary) to prevent
gear noise.
1. Clean all of the dirt from the area of the rear axle
housing cover before removing the rear axle
housing cover.
2. Remove the rear axle housing cover. Refer to
Rear Cover and Gasket Replacement.
3. Wipe the oil out of the rear axle housing.
4. Carefully clean each tooth of the ring gear.
5. Select the correct exciter ring protector from
J39446.
Attach the exciter ring protector to the speed
sensor reluctor wheel on vehicles with non-traction
control rear axles only.
6. Using a medium stiff brush, apply a mixture of
gear marking compound sparingly to all of the
ring gear teeth. The area of tooth contact of the
differential drive pinion gear should remain visible
Notice:
Refer to Fastener Notice in Cautions
and Notices.
7. Tighten the differential carrier bearing cap
bolts/screws.
Tighten
Tighten the differential carrier bearing cap
bolts/screw to 75 N·m (55 lb ft).
8. Apply the park brake until a torque of 54-70 N-m
(40-52 lb ft) is required in order to tum the drive
pinion gear.
Important: A test made without loading the gears will
not give a satisfactory pattern.
9. Use the following procedure in order to obtain a
ring gear tooth contact pattern:
9.1 . Turn the pinion gear yoke with a wrench so
that the ring gear rotates one full revolution.
9.2. Reverse the rotation so that the ring gear
rotates one revolution in the opposite
direction.
Rear Drive Axle 4-43