Jeep 1997 Grand Cherokee Service Manual page 172

ARBOR DISC PINION HEIGHT BLOCK
3 - 114 DIFFERENTIAL AND DRIVELINE
ADJUSTMENTS (Continued)
Fig. 71 Gauge Tools In Housing—Typical
Fig. 72 Pinion Gear Depth Measurement—Typical
lash measurements, measure the pinion gear depth
and prepare the pinion gear for installation. Estab-
lishing proper pinion gear depth is essential to estab-
lishing gear backlash and tooth contact patterns.
After the overall shim thickness to take up differen-
tial side play is measured, the pinion gear is
installed, and the gear backlash shim thickness is
measured. The overall shim thickness is the total of
the dial indicator reading, starting point shim thick-
ness, and the preload specification added together.
The gear backlash measurement determines the
thickness of the shim used on the ring gear side of
the differential case. Subtract the gear backlash shim
thickness from the total overall shim thickness and
select that amount for the pinion gear side of the dif-
ferential (Fig. 73).
ARBOR DIAL INDICATOR SCOOTER BLOCK PINION BLOCK ARBOR
DIFFERENTIAL CASE
DIFFERENTIAL SHIM-PINION GEAR SIDE AXLE HOUSING BEARING
PINION GEAR DEPTH SHIM STARTING POINT SHIM
Fig. 73 Axle Adjustment Shim Locations
DIFFERENTIAL PRELOAD AND GEAR
BACKLASH SHIM SELECTION
NOTE: It is difficult to salvage the differential side
bearings during the removal procedure. Install
replacement bearings if necessary.
(1) Remove side bearings from differential case.
(2) Install ring gear on differential case and
tighten bolts to specification.
(3) Install dummy side bearings 6929-A on differ-
ential case.
(4) Install differential case in axle housing.
(5) Insert Dummy Shim 8107 (0.118 in. (3.0 mm))
starting point shims between the dummy bearing
and the axle housing on side of differential (Fig. 74).
Fig. 74 Preload Measurement Starting PointShim
ZG