2002 DODGE RAM Service Repair Manual

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Page 169 of 2255

DODGE RAM 2002 Service Repair Manual (8) Select a shim equal to the dial indicator read-
ing plus the drive pinion gear depth variance number
etched in the face of the pinion gear (Fig. 4) using
the opposite sign on the variance number.

(8) Select a shim equal to the dial indicator read-
ing plus the drive pinion gear depth variance number
etched in the face of the pinion gear (Fig. 4) using
the opposite sign on the variance number. For exam-
ple, if the depth variance is ±2, add +0.002 in. to the
dial indicator reading.
(9) Remove the pinion depth gauge components
from the axle housing
DIFFERENTIAL BEARING PRELOAD AND GEAR
BACKLASH
Differential side bearing preload and gear backlash
is achieved by selective shims positioned behind thedifferential side bearing cones. The proper shim
thickness can be determined using slip-fit dummy
bearings D-346 in place of the differential side bear-
ings and a dial indicator C-3339. Before proceeding
with the differential bearing preload and gear back-
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 and the preload specifica-
tion 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 differential (Fig. 10). Differential
shim measurements are performed with axle
spreader W-129-B removed.
SHIM SELECTION
NOTE: It is difficult to salvage the differential side
bearings during the removal procedure. Install
replacement bearings if necessary.
(1) Remove differential side bearings from differ-
ential case.
(2) Remove factory installed shims from differen-
tial case.
(3) Install ring gear on differential case and
tighten bolts to specification, if necessary.
Fig. 7 PINION HEIGHT BLOCK
1 - PINION BLOCK
2 - PINION HEIGHT BLOCK
Fig. 8 GAUGE TOOLS IN HOUSING
1 - ARBOR DISC
2 - PINION BLOCK
3 - ARBOR
4 - PINION HEIGHT BLOCK
Fig. 9 PINION DEPTH MEASUREMENT
1 - ARBOR
2 - SCOOTER BLOCK
3 - DIAL INDICATOR
3 - 114 REAR AXLE - 286RBIBR/BE
REAR AXLE - 286RBI (Continued)

Page 170 of 2255

DODGE RAM 2002 Service Repair Manual (4) Install dummy side bearings D-346 on differen-
tial case.
(5) Install differential case in the housing.
(6) Install the marked bearing caps in their correct
positions. Install and snug the bolts (

Page 171 of 2255

DODGE RAM 2002 Service Repair Manual (8) Thread Pilot Stud C-3288-B into rear cover bolt
hole below ring gear (Fig. 14).
(9) Attach a dial indicator C-3339 to pilot stud.
Position the dial indicator plunger on a flat surface
between the

Page 172 of 2255

DODGE RAM 2002 Service Repair Manual (19) Push and hold differential case toward pinion
gear (Fig. 17).
(20) Zero dial indicator face to pointer (Fig. 17).
(21) Push and hold differential case to ring gear
side of the housing and record

Page 173 of 2255

DODGE RAM 2002 Service Repair Manual (33) Push and hold ring gear upward while not
allowing the pinion gear to rotate.
(34) Zero dial indicator face to pointer.
(35) Push and hold ring gear downward while not
allowing the pinion gear to

Page 174 of 2255

DODGE RAM 2002 Service Repair Manual Fig. 21 GEAR TOOTH CONTACT PATTERN
BR/BEREAR AXLE - 286RBI 3 - 119
REAR AXLE - 286RBI (Continued)

Page 175 of 2255

DODGE RAM 2002 Service Repair Manual SPECIFICATIONS
REAR AXLE - 286RBI
AXLE SPECIFICATIONS
DESCRIPTION SPECIFICATION
Axle Ratio 3.55, 4.10
Ring Gear Diameter 286 mm (11.25 in.)
Ring Gear Backlash 0.12-0.20 mm (0.005-0.008 in.)
Pinion Gea

Page 176 of 2255

DODGE RAM 2002 Service Repair Manual Installer, Seal 8152
Bridge 938
Splitter, Bearing 1130
Holder, Yoke 6719
Gauge, Pinion Depth Seting 6730
Puller C-452
Wrench C-3281
Dial Indicator Set C-3339
Handle C-4171
Installer C-4190
BR/BEREAR A

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