GMC T Series 1994 Repair Manual page 156

8. D ifferential side bearings (22) using J 29710,
J 8107-3, and J 8092 (figure 21).
• Place J 8107-3 into the differential on the side
opposite the bearing installation to protect the
differential case.
• Drive the bearing onto the case using J 29710
and J 8092.
9. Differential case (27) to the axle housing. Refer to
" Side Bearing Preload Adjustment."
SIDE BEARING PRELOAD ADJUSTMENT
NOTICE: For step s 5 and 6, refer to "Notice"
on page 4B3-1.
• The differential side bearing preload is adjusted by
a nut in the differential bearing bore. The bore and
bearing cap provide the mating threads for the nut.
• The differential must be initially preloaded in order
to determine the backlash of the gear set. After the
backlash has been set, the final bearing preload is
set.
Install or Connect (Figures 1, 22, and 23)
Tool Required:
J 24429 Side Bearing Backlash Adjusting
Wrench
1. The bearing cups (22) to the differential bearings in
their original locations.
2. Differential assembly in the axle housing.
3. Bearing shims (21).
• Push the case away from the pinion towards
the axle housing.
4. Adjusting nut (17).
A. Tighten the adjusting nut using J 24429.
B. Turn the pinion to seat the bearings.
C. Back off the adjusting nut.
5. Bearing caps (19) and bolts (20) in their original
positions.
A. Assemble the caps loosely.
B. Turn the adjusting nut until the nut contacts the
shim. Then tighten the nut three additional slots
(figure 22).
Tighten
S i
• Bolts (20) to 80 N-m (60 lbs. ft.).
6. Adjusting nut lock (16) and lock bolt (18).
• Measure the ring gear to pinion backlash. Refer
to " Backlash Adjustment."
Tighten
• Bolt (18) to 30 N-m (22 lbs. ft.) after setting the
backlash.
BACKLASH ADJUSTMENT
1. Install a dial indicator on the case using a magnetic
base.
2. Place the indicator stem at the heel end of a tooth.
• Set the dial indicator so the stem is in line with
the gear rotation and perpendicular to the tooth
angle.
3. Check and record the backlash at three or four
points around the ring gear (figure 23).
• The pinion must be held stationary when check­
ing backlash.
• The backlash should be the same at each point
within 0.05 mm (0.002 inch). If the backlash
varies more than 0.05 mm (0.002 inch), check
for burrs, a distorted case flange, uneven bolt­
ing conditions, or foreign matter between the
case and ring gear.
4. Backlash at the minimum lash point measured
should be between 0.125-0.200 mm (0.005-0.008
inch).
A. If the reading is too high, increase the shim
pack between the differential flange side of the
case and the axle housing (opposite the adjust­
ing nut side).
B. If the reading is too low, decrease the shim
pack between the differential flange side of the
case and the axle housing (opposite the adjust­
ing nut side).
5. Adjust the side bearing preload. Refer to " Side
Bearing Preload Adjustment."