Inspection; Axle Housing; Differential; Pinion And Ring Gear - GMC T Series 1994 Repair Manual

11. Ring gear (2) from the case using a soft-faced
hammer.
A. Ring gear (2) from the vise.
B. Put the case back in the vise.
NOTICE: Do not pry the ring gear from the
case. This will damage the ring gear and
case.
12. Roll pin (29) from the case using a hammer and
punch (figure 6).
13. Pinion shaft (28) using a hammer and brass drift
(figure 7).
14. Pinion gears (24) and thrust washers (26).
• Rotate the side gears until the pinion gears are
in the opening of the case (figure 8).
15. Side gears (25) and thrust washers (27).
• Mark the gears and washers left and right.
16. Replace the cover (14) using two bolts (17) to keep
the pinion from falling.
L*
Inspect
• Drive pinion rotating torque and record
(figure 9).
• For looseness of the pinion assembly by mov­
ing it back and forth. (Looseness indicates
excessive bearing or pinion wear).
17. Pinion nut (12) and washer (11) using J 8614-01 to
hold the pinion (figure 10).
18. Pinion flange (10) using J 8614-01 (figure 11).
19. Pinion (2) from the housing using a soft-faced ham­
mer to tap the pinion.
CAUTION: Do not allow the pinion to fall. It
can strike legs or feet and may cause serious
in jury. A lso, gear teeth m ay have sharp
edges. When handling, use care to avoid cut­
ting hands.
20. Cover (14) and pinion (2).
21. Pinion preload shims (6).
• Keep the shims together.
22. Pinion seal (9).
23. Outer bearing (7) and oil slinger (8).
24. Bearing cups (3 and 7) from the axle housing using
D-158 and C-4307 (figure 12).
25. Pinion adjusting shims (4) and baffle (if used).
• Keep the shims together.
26. P inion inn er bearing (3) using J 29721 and
J 29721-70. (figure 13).
CLEANING
Do not steam-clean drive parts that have ground and
polished surfaces such as gears, bearings, and shafts.
All parts should be disassembled before cleaning.
These parts should be cleaned in a suitable solvent.
Parts should be thoroughly dried immediately after
cleaning. Use soft, clean, lintless rags. Parts may be
dried with compressed air. Do not allow the bearings to
spin while drying them with compressed air.

INSPECTION

Carefully and thoroughly inspect all drive unit parts
before reassembly.
Thorough inspection of the drive parts for wear or
stress and subsequent replacement of worn parts will
eliminate costly drive component repair after reassem­
bly.

AXLE HOUSING

Lv
Inspect
• The axle housing bore for nicks or burrs that could
prevent the outer diameter of the pinion seal from
sealing. Remove any burrs that are found.
• The bearing cup bores for nicks or burrs. Remove
any burrs that are found.
• The housing for cracks. Replace the housing if any
cracks are found.
• The housing for foreign material such as metal
chips, dirt, or rust. Refer to " Cleaning."

DIFFERENTIAL

L*
Inspect
• Pinion gear shaft for unusual wear.
• Pinion gear and side gear teeth for wear, cracks,
scoring, and spalling.
• Thrust washers for wear.
• The fit of the side gears in the differential case.
• The fit of the side gears on the axle shafts.
• Differential case for cracks and scoring.
• All parts for wear and replace if necessary.

PINION AND RING GEAR

• Ring and pinion gears are matched sets and both
are replaced any time a replacement of either is
necessary.
Inspect
i?
• Pinion and ring gear teeth for cracking, chipping,
scoring, or excessive wear.
• Pinion gear splines for wear.
• Pinion flange splines for wear.
•T h e fit of the pinion gear splines on the pinion
flange.
• The sealing surface of the pinion flange for nicks,
burrs, or rough tool marks that could cause dam­
age to the inside diameter of the seal and result in
an oil leak.
• All worn or broken parts and replace if necessary.