Chevrolet 1988 Light Duty Truck Repair Manual page 231

• Press the bearings on using a suitable tool.
DIFFERENTIAL INSTALLATION
Install or C on n ect
1. Bearing cups (33) to the carrier (36).
2. A djusting nuts (32).
3. Bearing caps (25).
4. Cap bolts (23).
&
T ig h ten
• Bolts to 176 N m (130 ft. lbs.).
The bearing cups m ust have a hand fit in the
bearing bores: If the fit is too tight, rework the bore
with emery cloth, until a hand fit is obtained (figure
23).
R em ove or D isco nn ect
1. Cap bolts (23).
2. Bearing caps (25).
3. Adjusting nuts (32).
4. Bearing cups (33).
|-»+| Install or C on n ect
• Lubricate all parts with axle lubricant.
1. Bearing cups (33) onto the bearings.
2. Differential assem bly (36) to the carrier.
3. Bearing adjusting nuts (32).
• Turn the nuts hand-tight against the bearing
cups.
4. Bearing caps (25) (figure 24).
• Tap lightly into position.
5. Cap bolts (23).
SI
T ig h ten
• Bolts to 176 N m (130 ft. lbs.).
CHECKING RING GEAR RUN OUT
M easu re
1. Ring gear run out.
• Mount a dial indicator to the carrier. The dial
indicator stem should rest on the back face of
the ring gear.
• Loosen the adjusting nut opposite the ring
g e a r e n o u g h to n o tic e end p la y on the
indicator.
• Tighten the same adjusting nut just enough to
have 0.000-inch end play on the indicator.
• Rotate the gear, and check for run out. If the
run out e x c e e d s 0 .0 0 8 -in c h , rem ove the
differential, and determ ine the cause.
BACKLASH ADJUSTMENT
• The differential side bearing preload is adjusted by
two adjusting nuts in the differential bearing bore.
The bore and the bearing cap provide the mating
threads for the bearing nut.
• The differential must be initially preloaded in order
to determ ine the backlash of the gear set. After the
backlash has been set, the final bearing preload is
set.
12-INCH RING GEAR (ROCKWELL) 4B6-9
A djust
1. The bearing preload by tightening the adjusting nuts
(32) one notch each from 0.000 end play. Refer to
"C hecking Ring Gear Run O ut" (figure 25).
• Mount a dial indicator to the carrier (46). Place the
stem of the indicator onto the toe end of a tooth
(figure 26).
2. Backlash by moving the ring gear toward or away
from the pinion.
• If setting up the original ring and pinion gear
set, use the backlash reading obtained earlier.
• Set the backlash to 0.005 - 0.015-inch for new
gear sets.
• If the backlash is too high, move the ring gear
toward the pinion.
• If the backlash is too low, move the ring gear
away from the pinion.