(4) Place Arbor Disc 6732 on Arbor D-115-3 in posi-
tion in the housing side bearing cradles (Fig. 12).
NOTE: Arbor Discs 6732 has different step diame-
ters to fit other axles. Choose proper step for axle
being serviced.
(5) Install differential bearing caps on arbor discs
and install bearing cap bolts. Tighten bearing cap
bolts to 108 N·m (80 ft. lbs.).
(6) Assemble Dial Indicator C-3339 into Scooter
Block D-115-2 and secure set screw.
(7) Position Scooter Block/Dial Indicator flush on
the pinion height block. Hold scooter block and zero
the dial indicator.
(8) Slowly slide the scooter block across the pinion
height block over to the arbor (Fig. 13). Move the
scooter block till dial indicator crests the arbor, then
record the highest reading.
(9) Select a shim/oil slinger equal to the dial indi-
cator reading plus the pinion depth variance number
etched in the face of the pinion (Fig. 8). For example,
if the depth variance is –2, add +0.002 in. to the dial
indicator reading.
PRELOAD SHIM SELECTION
Differential side bearing preload and gear backlash is
achieved by selective shims positioned between the dif-
ferential side bearing cups and the housing. The proper
shim thickness is determined using slip-fit Dummy
Bearings D-345 in place of the differential side bearings
and a Dial Indicator C-3339. Before proceeding with the
differential bearing preload and gear backlash measure-
ments, measure the pinion gear depth and prepare the
pinion for installation. Establishing proper pinion gear
depth is essential to establishing gear backlash and
tooth contact patterns. After the overall shim thickness
to take up differential side play is measured, the pinion
is installed, and the gear backlash shim thickness is
measured. The overall shim thickness is the total of the
dial indicator reading and the preload specification
added together. The gear backlash measurement deter-
mines 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
differential (Fig. 14). Differential shim measurements
are performed with spreader W-129-B removed.
Fig. 12 GAUGE TOOLS IN HOUSING
1 - ARBOR DISC
2 - PINION BLOCK
3 - ARBOR
4 - PINION HEIGHT BLOCK
Fig. 13 PINION DEPTH MEASUREMENT
1 - ARBOR
2 - SCOOTER BLOCK
3 - DIAL INDICATOR
Fig. 14 SHIM LOCATION
1. PINION DEPTH SHIM
2. DIFFERENTIAL SHIM PINION GEAR SIDE
3. RING GEAR
4. DIFFERENTIAL SHIM RING GEAR SIDE
TJ
FRONT AXLE - 216FBI
3 - 57
FRONT AXLE - 216FBI (Continued)