GMC 1982 Light Duty Truck, Service Manual

Page: 458 / 1435

4 B 3 - 4 R EA R A X L E
J— 2 4 3 8 3
Fig. 4B3-7--lnstalling Side Bearing
D IF F E R E N T IA L C A S E
Reassembly
1. Assemble new washers to side gears. Apply a small
am ount of hypoid lubricant on the side gear hubs.
2. Assemble pinion gears and new washers onto cross
shaft.
3. Place side gears, pinion gears, cross shaft and washers
into flanged half of case.
4. Assemble top half of case to bottom half, making sure
scribe marks are aligned.
5. Assemble body bolts finger tight. Then tighten bolts
alternately to specifications.
6. Install ring gear to differential case.
7. Install ring gear-to-case bolts finger tight, then tighten
alternately to specifications.
8. Place side bearing into position and install, using tools
J-8092 and bearing installer J-24383 as shown in figure
4B3-7.
9. Install bearing on opposite side in the same manner. Be
sure to support differential case on pilot plug J - 8 107-3.
S H IM REQUIREM ENTS - G A G IN G PROCEDURES
Side Bearing Shims
1. With the pinion removed from the carrier, place the
bearing cups over the side bearings, and install the
differential case into the carrier.
2. Place the shim which was originally installed on the
ring gear side into its original position.
3. Install the bearing caps lightly in th eir m ark ed
positions. Tighten the caps just enough to keep the
bearings in place.
4. M ount a dial indicator on the carrier with the tip of the
indicator on the back face of the ring gear.
5. Position two screwdrivers between the bearing shim
and carrier on the ring gear side of the case. Pull on the
screwdrivers and force the differential case as far as
possible away from the dial indicator.
6. With force still ap p lie d , s e t th e i n d ic a to r dial to
“ z e ro ” , being sure the probe is still in co n tact with the
ring gear.
7. Reposition the screwdrivers to the opposite side of the
differential case as shown in figure 4B3-8.
8. Pull on the screwdrivers and force the differential case
back toward the dial indicator. R epeat several times
until the same indicator reading is obtained.
9. To the dial indicator reading, add the thickness of the
shim. Record the result, as this figure will be
Old Pinion
Marking
New Pinion Marking
- 4 - 3 - 2
- 1 0 + 1 + 2
+ 3 + 4
+ 4 + 0.008
+ 0.007
+ 0.006
+ 0.005 + 0.004 + 0.003 + 0.002
+ 0.001 0
+ 3 + 0.007
+ 0.006 + 0.005 + 0.004 + 0.003
+ 0.002 + 0.001 0 - 0.001
+ 2 + 0.006
+ 0.005 + 0.004 + 0.003 + 0.002 + 0.001
0 - 0.001 - 0.002
+ 1 + 0.005 + 0.004 + 0.003 + 0.002 + 0.001
0 - 0.001 - 0.002 - 0.003
0
+ 0.004
+ 0.003
+ 0.002 + 0.001 0
- 0.001 - 0.002 - 0.003 - 0.004
- 1
+ 0.003 + 0.002 + 0.001 0
- 0 .001 - 0.002 - 0.003 -0.004 - 0.005
- 2 + 0.002
+ 0.001 0 - 0.001
- 0.002 - 0.003 - 0.004 - 0.005 - 0.006
- 3 + 0.001 0
- 0.001 - 0 .002 - 0 .003
- 0 .004 - 0.005 - 0.006
- 0 .007
- 4 0
- 0.001 -0.002 - 0.003
- 0 004 - 0.005 - 0.006
- 0.007 - 0.008
Fig. 4B3-8 -Screwdrivers Against Case I
Fig. 4 B 3 -9 --D a n a Pinion C o d e C h a rt