Jeep 1996 Grand Cherokee Service Manual page 81

3 - 36 DIFFERENTIAL AND DRIVELINE
DISASSEMBLY AND ASSEMBLY (Continued)
ing on the hub with Bearing Installer C– 3716A and
Driver Handle C–4171 (Fig. 49).
Fig. 49 Differential Bearing Installation
(9) Position the remaining zero end–play shims on
hub at opposite side of case. Include an additional
0.015 in. (0.38 mm) thick shim on this hub. This will
provide the required differential bearing preload.
(10) Install bearings
C–3716A and Handle C–4171 (Fig. 49).
(11) Match each bearing cup with bearing (origi-
nal). Install the cups on the bearings.
BACKLASH AND CONTACT PATTERN ANALYSIS
(1) Rotate assembly several revolutions to seat
bearings. Measure backlash at three equally spaced
locations around the perimeter of the ring gear with
a dial indicator (Fig. 50).
The ring gear backlash must be within 0.12 –
0.20 mm (0.005 – 0.008 inch). It cannot vary
more than 0.05 mm (0.002 inch) between the
points checked.
If backlash must be adjusted, transfer shims from
one side of carrier to the other side. Adjust the back-
lash accordingly (Fig. 51). DO NOT INCREASE
THE TOTAL SHIM PACK THICKNESS, EXCES-
SIVE BEARING PRELOAD AND DAMAGE WILL
OCCUR.
If the mesh and backlash steps have been followed,
good gear teeth contact patterns should exist.
The ring gear teeth contact patterns will show if
the pinion gear depth is correct. It will also show if
the ring gear backlash has been adjusted correctly.
The backlash must be maintained within the speci-
on hubs with Installer
Fig. 50 Ring Gear Backlash Measurement
Fig. 51 Backlash Shim Adjustment
fied limits until the correct tooth contact patterns are
obtained.
(2) Apply a thin coat of hydrated ferric oxide (yel-
low oxide of iron) to the drive and coast side of the
ring gear teeth.
(3) Rotate the ring gear one complete revolution in
both directions while a load is being applied. Insert a
pry bar between the differential housing and the case
flange to load gears. This will produce a distinct con-
tact patterns on both the drive side and coast side of
the ring gear teeth.
(4) Note patterns in compound. Refer to (Fig. 52)
for interpretation of contact patterns and adjust
accordingly.
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