GMC 1989 Light Duty Truck Repair Manual page 156

8
4B2-8 1 / 2-INCH RING GEAR
DIFFERENTIAL CASE ASSEMBLY
-►+ Install or C onnect (Figure 1)
Tools Required:
J 8107-4 Differential Side Bearing Remover
Plug
J 8092 Driver Handle
J 22761 Differential Side Bearing Installer
• Lubricate all parts with rear axle lubricant.
1
. Side gear thrust washers (19) to the side gears (
2 22
. Side gears ( ) to the differential case (24).
• Place the side gears in place on the same side
as removed.
3. Pinion gears (21) to the differential without the thrust
washers ( 20 ).
• Place one pinion gear onto the side gears so
that the holes in the pinion gears are 180
degrees apart.
• Rotate the pinion gears into place, and verify
that the pinion gears line up with the pinion
shaft holes.
4. Pinion thrust washers (20).
• Rotate the pinion gears toward the differential
opening just enough to slide in the pinion
thrust washers.
• C he ck th a t th e m a tin g s u rfa c e s of the
differential case and the ring gear are clean
and burr free.
5. Ring gear (7) to the differential case (24).
• Thread two left-hand threaded studs into the
ring gear on opposite sides (figure 17).
• Place the ring gear onto the case, and align
the holes in the case with the studs.
• 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).
6 . New ring gear bolts (23).
• Tighten the ring gear bolts alternately in
stages gradually pulling the ring gear onto the
differential case.
$ Tighten
• T h e ring g ear bolts in se q u e n c e to 8 0 N-m (60
ft. lbs.).
7. Differential side b earings (8) using J 22761, J 8107-4
and J 8 0 9 2 (figure 19).
• P lace J 8107-4 into the differential on the side
opposite of bearing installation to protect the
differential case.
• Drive the bearing onto the case using J 22761
and J 80 92 .
22
).
8
. Differential case (24) to the axle housing. R efer to
" S ide Bearing Preload A d ju s tm en t" in this section.
SIDE BEARING PRE-LOAD ADJUSTMENT
• T h e differential side bearing preload is adjusted by
ch anging the thickness of both the left and right
s h im s e q u a lly .
backlash.
• Production shim s are cast iron and are not to be
reused.
• S ervice spacers are 0.170 to 0.172-inch thick.
T h is w ill m a in ta in th e o rig in a l