GMC 1982 Light Duty Truck Service Manual page 429

8-1/2 and 8-7/8 and 9-1/2 RING GEAR
procedure of components in this portion of the manual as indicated at
appropriate locations by the terminology "See Notice on Page 1 of this
Section".
NOTICE: This fastener is an important attaching part in
that it could affect the performance of vital components
and systems, a n d /o r could result in m ajor repair
expense. It must be replaced with one of the same part
num ber or with an equivalent part if replacem ent
On-Vehicle Se rv ic e ........................................................... 4B1-1
Axle A ssem b ly ................................................................. 4 B 1 -1
Axle S h a f t ......................................................................... 4B1-2
Oil S e a l/B e a rin g ........................................................... 4B1-3
Brake Backing P la te ...................................................... 4B1-4
Wheel Bolts....................................................................
Pinion Flange (Dust Deflector)................................... 4B1-4
Unit R e p a ir......................................................................... 4B1-6
Differential C a s e ............................................................. 4B1-6
Construction of the axle assembly is such that service
operations may be performed with the housing installed in
the vehicle or with the housing installed in a holding fixture.
T he following removal and installation procedure is
necessary only when the housing requires replacement.
NOTICE: See N O T I C E on page 1 of this section,
regarding Axle Assembly fasteners.
Removal
1. Raise vehicle on hoist.
2. Support rear axle assembly with suitable lifting device,
so th a t tension is relieved in springs and shock
absorbers.
3. Remove trunnion bearing " U " bolts from the axle
companion flange, sep a ra te trunnion from flange,
position propeller shaft to one side and tie it to frame
side rail.
Secure trunnion bearing caps to trunnion, using
masking tape or a large rubber band, to prevent loss of
bearings.
4. Disconnect shock absorbers at lower attachm ent points
and position out of the way.
5. Disconnect axle vent hose from vent connector and
position vent hose to one side.
6. Disconnect hydraulic brake hose at connector on axle
housing. Remove brake d ru m , disconnect parking
SECTION 4B1
AXLE
The following notice applies to one or more steps in the assembly
CONTENTS
4B1-4
ON-VEHICLE SERVICE
becomes necessary. Do not use a replacement part of
lesser quality or substitute design. Torque values must
be used as specified during reassembly to assure proper
retention of this part.
Bearing R e p la c e m e n t................................................. 4B1-6
Ring Gear or Differential Case R ep la c e m e n t...... 4B1-7
Backlash A djustm ent................................................... 4B1-8
Drive P in io n ..................................................................... 4B1-10
Drive Pinion B e a rin g ................................................ 4 B 1-11
Setting Pinion D e p t h ................................................ 4B1-12
Installation and A d ju stm en t.................................... 4B1-13
Operational Checks and A d ju stm e n ts ...................... 4B1-15
brake cable at actuating levers and at flange plate.
Refer to Section 5 for cable removal and brake details.
Remove axle " U " bolt nuts, " U " bolts, spacers and
clamp plates.
7. Lower axle assembly and remove from vehicle.
In s ta lla tio n
1. Position axle assembly under vehicle and align with
springs.
2. Install spacer, clam p plate and " U " bolts to axle
assembly, loosely install retaining nuts to " U " bolts.
3. Position shock absorbers in lower attachm ent brackets
and loosely install nut to retain shock.
4. Connect axle vent hose to vent connector at carrier.
5. Connect hydraulic brake hose to connector on axle
housing, connect parking brake cable to a c tu a tin g
levers. Install brake drum and wheel and tire assembly-
bleed brakes and adjust parking brake as outlined in
applicable portion of Section 5.
6. Reassemble the propeller shaft to companion flange,
making sure that bearing caps are indexed in flange
seat. T orque bearing
specifications.
7. Position vehicle so that weight is placed on suspension
components and torque affected parts to specifications.
8. Lower vehicle and remove from hoist.
REAR A X LE 4 B 1 -1
cap retaining nuts to