GMC 1989 Light Duty Truck Repair Manual page 170

4B3-8 91 /2-INCH RING GEAR
tightening. Each tightening increases the
bearing preload by several pounds. If the
bearing preload is exceeded, the pinion will
have to be removed, and a new collapsible
spacer installed.
• Once the preload has been obtained, rotate
the pinion several times to assure that the
bearings have seated. Recheck the preload,
and adjust if necessary.
8
. Differential case. Refer to " Backlash Adjustm ent" in
this section.
DIFFERENTIAL CASE ASSEMBLY
[-► <-[ Install or C onnect (Figure 1)
Tools Required:
J 8107-3 Differential Side Bearing Removal
Plug
J 8092 Driver Handle
J 29710 Differential Side Bearing Installer
• Lubricate all parts with rear axle lubricant.
1 . Side gear thrust washers (32) to the side gears (33).
2
. Side gears (33) to the differential case (27).
• Place the side gears in place on the same side
as removed.
3. Pinion gears (31) to the differential without the thrust
washers (30).
• Place the pinion gears 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 (30).
• Rotate the pinion gears toward the differential
opening just enough to slide in the pinion
thrust washers.
• C h e 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 (15) to the differential case (27).
• Thread two left-hand threaded studs into the
ring gear on opposite sides.
• Place the ring gear onto the case, and align
the holes in the case with the studs (figure 18).
• Press the ring gear onto the case far enough
to start the bolts using J 8107-3 to protect the
differential from the press ram (figure 19).
6
. New ring gear bolts (26).
• Tighten the ring gear bolts alternately in
stages gradually pulling the ring gear onto the
differential case.
T ighten
• The ring gear bolts in sequence to 145 N m
(105 ft. lbs.).
7. D iffe re n tia l side b e a rin g s (22) using J 29710,
J 8107-3 and J 8092 (figure 20).
• Place J 8107-3 into the differential on the side
opposite of bearing installation to protect the
differential case.
• Drive the bearing onto the case using J 29710
and J 8092.
A. L e ft H and S tu d s
20. R ing G ear
24. D iffe re n tia l Case
Figure 19— Installing the Ring Gear to the Case
J
F igure 2 0 — Installing th e S ide B earing
A
J-2 9 7 1 0
F-04732