2001 DODGE RAM Service Repair Manual

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Page 129 of 2889

DODGE RAM 2001 Service Repair Manual (31) Rotate the differential case several times to
seat the side bearings.
(32) Position the indicator plunger against a ring
gear tooth (Fig. 19).
(33) Push and hold ring gear upward while not
allowi

(31) Rotate the differential case several times to
seat the side bearings.
(32) Position the indicator plunger against a ring
gear tooth (Fig. 19).
(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 rotate. Dial indicator
reading should be between 0.12 mm (0.005 in.) and
0.20 mm (0.008 in.). If backlash is not within specifi-
cations transfer the necessary amount of shim thick-
ness from one side of the housing to the other (Fig.
20).
(36) Verify differential case and ring gear runout
by measuring ring to pinion gear backlash at eight
locations around the ring gear. Readings should not
vary more than 0.05 mm (0.002 in.). If readings vary
more than specified, the ring gear or the differential
case is defective.
After the proper backlash is achieved, perform
Gear Contact Pattern Analysis procedure.
GEAR CONTACT PATTERN
The ring and pinion gear contact patterns will
show if the pinion depth is correct. It will also show
if the ring gear backlash has been adjusted correctly.
The backlash can be adjusted within specifications to
achieve desired tooth contact patterns.
(1) Apply a thin coat of hydrated ferric oxide or
equivalent to the drive and coast side of the ring gear
teeth.
(2) Wrap, twist and hold a shop towel around the
pinion yoke to increase the turning resistance of the
pinion. This will provide a more distinct contact pat-
tern.
(3) With a boxed end wrench on the ring gear bolt,
rotate the differential case one complete revolution in
both directions while a load is being applied from
shop towel.
The areas on the ring gear teeth with the greatest
degree of contact against the pinion teeth will squee-
gee the compound to the areas with the least amount
of contact. Note and compare patterns on the ring
gear teeth to Gear Tooth Contact Patterns chart (Fig.
21)and adjust pinion depth and gear backlash as nec-
essary.
Fig. 19 Ring Gear Backlash Measurement
1 - DIAL INDICATOR
Fig. 20 Backlash Shim
3 - 56 FRONT AXLE - 248FBIBR/BE
FRONT AXLE - 248FBI (Continued)

Page 130 of 2889

DODGE RAM 2001 Service Repair Manual Fig. 21 Gear Tooth Contact Patterns
BR/BEFRONT AXLE - 248FBI 3 - 57
FRONT AXLE - 248FBI (Continued)

Page 131 of 2889

DODGE RAM 2001 Service Repair Manual SPECIFICATIONS
FRONT AXLE - 248FBI
AXLE SPECIFICATIONS
DESCRIPTION SPECIFICATION
Axle Ratio 3.55, 4.10
Ring Gear Diameter 248 mm (9.75 in.)
Ring Gear Backlash 0.12-0.20 mm (0.005-0.008 in.)
Pinion Gea

Page 132 of 2889

DODGE RAM 2001 Service Repair Manual PILOTS, STUDS - C-3288-B
DIAL INDICATOR, SET - C-3339
INSTALLER, FLANGE - C-3718
HANDLE, DRIVE - C-4171
INSTALLER, BEARING - C-4190
INSTALLER, CUP - C-111
INSTALLER, CUP - C-146
REMOVER, CUP - D-158
R

Page 133 of 2889

DODGE RAM 2001 Service Repair Manual AXLE SHAFTS
REMOVAL
(1) Raise and support the vehicle.
(2) Remove wheel and tire assembly.
(3) Remove brake caliper and rotor. Refer to
Brakes for procedures.
(4) Remove ABS wheel speed sensor if equi

Page 134 of 2889

DODGE RAM 2001 Service Repair Manual INSTALLATION - INTERMEDIATE AXLE
(1) Position the bushing on installation tool and
seat the bushing (Fig. 24) in the housing bore.
(2) Clean the inside perimeter of the axle shaft
tube with fine crocu

Page 135 of 2889

DODGE RAM 2001 Service Repair Manual AXLE VACUUM MOTOR
DESCRIPTION
The disconnect axle control system consists of:
²Shift motor.
²Indicator switch.
²Vacuum switch.
²Vacuum harness (Fig. 27).
OPERATION
The shift motor receives a vacuu

Page 136 of 2889

DODGE RAM 2001 Service Repair Manual DIAGNOSIS AND TESTING - VACUUM MOTOR
AXLE VACUUM SHIFT MOTOR
BR/BEFRONT AXLE - 248FBI 3 - 63
AXLE VACUUM MOTOR (Continued)

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