GMC S Series 1994 Repair Manual Download

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7. Differential side bearings (18) using J 24429 and

J 8092.

A. Place J 8107 into the differential on the side

opposite of bearing installation to protect the
differential case.

B. Drive the bearing onto the case using J 24429

and J 8092.

8. Differential case (34) to the axle housing. Refer to

“ Side Bearing Preload Adjustment.”

SIDE BEARING PRELOAD ADJUSTMENT

• The differential side bearing preload is adjusted by

two  adjusting  nuts  in  the  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 determine the backlash of the gear set. After the

backlash has been set, the final bearing preload is
set.

Install or Connect (Figures 1 and 16)

Tool Required:

J 24429 Side Bearing Adjustment Wrench

1. Bearing caps (20) to the bearings in their original

locations.

2. Differential assembly to the housing.
3. Adjusting nuts (19).

NOTICE: Refer to “Notice” on page 4B4-1.

4. Bearing caps (20) and bolts (28) in their original

positions.

A. Assemble the caps finger tight.

B. Loosen the right side adjusting nut and tighten

the left side nut using J 24429 until the ring
gear contacts the drive pinion (figure 16). Do

not force the gears into contact. This is the zero
lash point.

C. Back off the left adjusting nut approximately two

slots to obtain the initial backlash adjustment.

5. Adjusting nut lock (21) and lock bolt (22) to the left

nut.

A. Do not tighten.

B. Tighten the right adjusting nut firmly to force the

case into solid contact with the left adjusting
nut. Rotate the pinion several times to seat the
bearings.

C. Loosen the right adjusting nut until it is free

from its bearing.

D. Tighten the right adjusting nut until it just con

tacts the bearing. Additionally tighten the nut
two slots for used bearings, or three slots if new

bearings are installed.

Tighten

• Bearing cap bolts (28) to 183 N-m

(135 lbs. ft.).

• Measure the ring gear to pinion backlash. Refer to

“ Backlash Adjustment.”

BACKLASH ADJUSTMENT

1. Install a dial indicator to the case using a magnetic

base (figure 17).

2. Place the indicator stem at the heel end of a tooth.

• Set the dial indicator so that 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.

• 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  (0.002  inch),  check  for
burrs,  a  distorted  case  flange,  uneven  bolting
conditions,  or  foreign  matter  between  the  case
and  the  ring  gear.

4. The backlash at the minimum lash point measured

should  be  between  0.125-0.200  mm  (0.005-0.008
in c h ).  The  m axim um   a c c e p ta b le   re a d in g   is
0.076-0.203  mm  (0.003-0.008  inch).

GMC S Series 1994, Repair Manual

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