Assembly Of The Rear Axle - GMC 1990 Light Truck Repair Manual

PINION AND RING GEAR
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 on the pinion flange.
The sealing surface of the pinion flange for nicks,
burrs, or rough tool marks which would cause
damage to the seals' inside diameter and result in
an oil leak.
Replace all worn or broken parts.
Ring and pinion gears are matched sets and are
both replaced any time a replacement of either is
necessary.
Figure 9—Removing the Pilot Bearing
1
10 /2-INCH RING GEAR 4B4-5
BEARINGS
I ? Inspect
Bearings visually and by feel.
The bearings should feel smooth when oiled and
rotated while applying as much hand pressure as
possible.
The large end of the bearing rollers for wear. This is
where tapered roller bearing wear is most evident.
Bearing cups for wear, cracks, brinelling and
scoring.
Bearings and cups are only replaced as sets.
If the rear axle was operated for an extended period
of time with very loose bearings, the ring gear and
drive pinion will also require replacement.
Low mileage bearings may have minute scratches
and pits on the rollers and the bearing cups from the
initial preload. Do not replace a bearing for this
reason.
Bearing caps for cracks or chips.
SHIMS
Inspect
L*
• Shims for cracks and chips. Damaged shims should
be replaced with an equally sized service shim.

ASSEMBLY OF THE REAR AXLE

PINION ASSEMBLY
-► «- Install or Connect (Figure 1)
Tools Required:
J 24433 Rear Pinion Bearing Cone Installer
J 8092 Driver Handle
J 8608 Outer Pinion Bearing Cup Installer
J 8614-01 Pinion Flange Holder
• Lubricate all parts with axle lubricant.
1. Pinion rear bearing (13) onto the pinion.
• Press the bearing onto the pinion using
J 24433 (figure 10).