Side Bearing Preload Adjustment - GMC 1989 Light Duty Truck Repair Manual

• Press the ring gear onto the case far enough
to start the bolts using J 8107-4 to protect the
differential from the press ram (figure 18).
7. New ring gear bolts (23).
• Tighten the ring gear bolts alternately in
stages gradually pulling the ring gear onto the
differential case.
& Tighten
• The ring gear bolts in sequence to 80 N-m (60
ft. lbs.).
8. Differential side bearings (8) using J 22761, J 8107-4
and J 8092 (figure 19).
• Place J 8107-4 into the differential on the side
opposite of the bearing installation to protect
the differential case.
• Drive the bearing onto the case using J 22761
and J 8092.
9. Differential case (24) to the axle housing. Refer to
" Side Bearing Preload Adjustm ent" in this section.
Figure 17— Ring G ear Studs
1/2-INCH RING GEAR 4C1-9
8
SIDE BEARING PRELOAD
ADJUSTMENT
Tool Required:
J 22779 Side Bearing Backlash Gage
• The differential side bearing preload is adjusted by
changing the thickness of both the left and right
shim s equally. This w ill m aintain the o rig in a l
backlash.
• Production shims are cast iron and are not to be
reused.
• Service spacers are available from 4.32 to 4.37 mm
(0.170 to 0.172-inch) thick.
• Service shims are available in kits from 0.040 to
0.070-inch.
• Be sure that the side bearing surfaces are clean and
free of burrs.
1. Place the differential case and the bearing cups into
the axle housing.
• L u b ric a te th e a x le b e a rin g s w ith
lubricant.
Figure 19— D ifferen tial B earing Installation
a x le