Jeep 1996 Grand Cherokee Service Manual page 83

3 - 38 DIFFERENTIAL AND DRIVELINE
DISASSEMBLY AND ASSEMBLY (Continued)
FINAL ASSEMBLY
(1) Install the axle shafts. Refer to Axle Shaft
Installation in this Group.
(2) Scrape the residual sealant from the housing
and cover mating surfaces. Clean the mating surfaces
with mineral spirits. Apply a bead of Mopar Silicone
Rubber Sealant on the housing cover. Allow the seal-
ant to cure for a few minutes.
Install the housing cover within 5 minutes
after applying the sealant. If not installed the
sealant must be removed and another bead
applied.
(3) Install the cover on the differential with the
attaching bolts. Install the identification tag. Tighten
the cover bolts with 41 N·m (30 ft. lbs.) torque.
CAUTION: Overfilling the differential can result in
lubricant foaming and overheating.
(4) Refill the differential housing with the speci-
fied quantity of Mopar Hypoid Gear Lubricant.
(5) Install the fill hole plug and tighten to 34 N·m
(25 ft. lbs.) torque.
CLEANING AND INSPECTION
CARDAN U-JOINT
(1) Clean all the U–joint yoke bores with cleaning
solvent and a wire brush. Ensure that all the rust
and foreign matter are removed from the bores.
(2) Inspect the yokes for distortion, cracks and
worn bearing cap bores.
(3) Replace the complete U–joint if any of the com-
ponents are defective.
DIFFERENTIAL
Wash differential components with cleaning solvent
and dry with compressed air. Do not steam clean
the differential components.
Wash bearings with solvent and towel dry, or dry
with compressed air. DO NOT spin bearings with
compressed air. Cup
replaced as a matched sets only.
Clean axle shaft tubes and oil channels with clean
cloth.
Inspect for;
• Smooth appearance with no broken/dented sur-
faces on the bearing rollers or the roller contact sur-
faces.
• Bearing cups must not be distorted or cracked.
• Machined surfaces should be smooth and with-
out any raised edges.
• Raised metal on shoulders of cup bores should
be removed with a hand stone.
and bearing must
• Wear or damage to pinion gear mate shaft, pin-
ion gears, side gears and thrust washers. Replace as
a matched set only.
• Worn or chipped teeth to ring and pinion gears.
• Damaged bolt threads to ring gear. Replaced as
a matched set only.
• Pinion yoke for cracks, worn splines, pitted
areas, and a rough/corroded seal contact surface.
Repair or replace the as necessary.
SPECIFICATIONS
FRONT AXLE—MODEL 30
Axle Type . . . . . . . . . . . . . . . . . . . . . . . . . . . .Hypoid
Lubricant. . . . . . . . . .SAE Thermally Stable 80W–90
Lube Capacity . . . . . . . . . . . . . . . . .1.48 L (3.13 pts.)
Axle Ratio . . . . . . . . . . . . . . . . . . .3.07 3.55 3.73 4.10
Differential. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Side Gear Clearance .0.12–0.20 mm (0.005–0.008 in.)
Ring Gear. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Diameter . . . . . . . . . . . . . . . . . . .18.09 cm (7.125 in.)
Backlash . . . . . . . . . . . .0–0.15 mm (0.005–0.008 in.)
Pinion Std. Depth . . . . . . . . . . . .92.1 mm (3.625 in.)
Pinion Bearing Preload . . . . . . . . . . . . . . . . . . . . . . .
Original Bearing. . . . . . . . . .1–2 N·m (10–20 in. lbs.)
New Bearing . . . . . . . . . . .1.5–4 N·m (15–35 in. lbs.)
TORQUE—MODEL 30 AXLE
DESCRIPTION
Fill Hole Plug . . . . . . . . . . . . . . . .34 N·m (25 ft. lbs.)
Diff. Cover Bolt. . . . . . . . . . . . . . .41 N·m (30 ft. lbs.)
Bearing Cap Bolt . . . . . . . . . . . . .61 N·m (45 ft. lbs.)
Ring Gear Bolt. . . . . . . . .95–122 N·m (70–90 ft. lbs.)
Shift Motor Bolt . . . . . . . . . . . . . . .11 N·m (8 ft. lbs.)
Axle Nut . . . . . . . . . . . . . . . . . .237 N·m (175 ft. lbs.)
Wheel Brg. Bolt . . . . . . . . . . . . .102 N·m (75 ft. lbs.)
Lower Ball Stud . . . . . . . . . . . . .108 N·m (80 ft. lbs.)
Upper Ball Stud . . . . . . . . . . . . .101 N·m (75 ft. lbs.)
ABS Sensor Bolt. . . . . . . . . . . . . .11 N·m (96 in. lbs.)
be
ZJ
TORQUE