GMC S Series 1994, Repair Manual

Page: 140 / 919

4. Insert J 22779 between the axle housing and left
bearing cup (figure 21).
5. Move the tool back and forth in the bore while
turning the adjusting nut clockwise until a notice­
able drag is produced (figure 22).
A. Tighten the lock bolt on the side of the tool.
B. Leave the tool in place.
6. Install a service spacer (9) and service shim (9)
between the right bearing cup and axle housing.
7. Determine bearing preload by inserting progres­
sively larger feeler gauge sizes between the carrier
and service shim.
• Push the feeler gauge downward so it contacts
the shim at the top and bottom and then con­
tacts the axle housing.
• The point just before additional drag begins is
the correct feeler gauge thickness. This is the
zero setting without preload.
8. Remove the strap, J 22779, the service spacer,
service shim, feeler gauge, and differential case
from the axle housing.
9. Measure J 22779 in three places using a microme­
ter. Average the readings (figure 23).
10. Add the dimensions of the right side service spac­
er, service shim, and feeler gauge.
11. For an initial backlash setting, move the ring gear
away from the pinion by subtracting 0.010 inch
from the ring gear side shim pack and adding
0.010 inch to the shim pack on the opposite side.
12. To obtain the proper preload on the side bearings
add 0.10 mm (0.004 inch) to the measurement of
each shim pack.
13. Install the differential. Refer to “ Backlash Adjust­
ment.”
BACKLASH ADJUSTMENT
1. Install the differential case, bearing cups, spacers,
and shims as determined from the “ Side Bearing
Preload Adjustment.” (figure 24).
• Tap the final shim into position, using a soft
faced hammer.
2. Rotate the case several times to seat the bearings.
3. Install a dial indicator to the case using a magnetic
base.