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

Figure 9— Installing the Inner Pinion Bearing

AXLE HOUSING

L*
Inspect
• The axle housing bore for nicks or burrs that can
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.
• 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

Inspect
L*
• Pinion 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. A new pinion flange must be replaced
when both ring gear and pinion gear are replaced
to maintain proper system balance.
L*
Inspect
• Pinion and ring gear teeth for cracking, chipping,
scoring, or excessive wear.
• Pinion splines for wear.
• Pinion flange splines for wear.
• The fit of the pinion gear splines on the pinion
flange.
• The sealing surface of the pinion flange for nicks,
burrs, or rough tool marks which would cause dam­
age to the seal's inside diameter and result in an
oil leak.
• All worn or broken parts and replace if necessary.

BEARINGS

Inspect
I?
Bearings for smooth rotation after oiling them.
Bearing rollers for wear.
Bearing cups for wear, cracks, brinelling, and scoring.
Important
• When replacing worn or cracked bearings and
cups, make sure to replace them in sets.
• Ring gear and pinion gear for wear. If worn,
replace them as a set.
Important
• Low m ileage bearings m ay have very sm all
scratches and pits on the rollers and bearing cups
from the initial preload. Do not replace a bearing
for this reason.

SHIMS

Inspect
I?
• Shims for cracks and chips. Damaged shims
should be replaced with an equal size service
shim.