Ring Gear- - GMC 1986 P-Truck Service Manual

The following " Notice" applies to one or more steps in the assembly procedure of components in this portion of
the manual as indicated at appropriate locations by the terminology: " NOTICE: See 'Notice' on page 4B-1 of this
section."
NOTICE: All rear axle fasteners are important attaching parts in that they could affect the performance of vital
parts and systems, and/or could result in major repair expense. They must be replaced with one of the same
part number or with an equivalent part if replacement 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 all parts.
SUBJECT
D e s c rip tio n .................................................................................................................................................................. 4B - 2
Rear Axle O peration...............................................................................................................................................4 B - 2
Diagnosis of the Rear A x le ...................................................................................................................................... 4 B - 3
Diagnosis of N o is e ................................................................................................................................................. 4 B - 3
Diagnosis of Tapered Roller B e a rin g s .............................................................................................................. 4B -
On-Vehicle Service..................................................................................................................................................... 4B-10
Rear Axle Assem bly R e p la ce m e n t.....................................................................................................................4B-10
Axle Shaft, Oil Seal and Bearing Replacement
( 81 / 2 - 91 / 2 -lnch Ring Gear-Semi-Floating A xle)............................................................................................... 4B-10
Brake Backing Plate Replacement (
Wheel Stud Replacement (
Pinion Flange, Dust Deflector/O il Seal Replacement
( 81 / 2 - 91 / 2 -lnch Ring Gear-Semi-Floating A x le s )...........................................................................................4B-14
Axle Shaft Replacement (
Hub And Drum Assem bly Replacement (
Wheel Bearing/Cup Replacement (
Non-Demountable Type Drum R eplacem ent....................................................................................................4B-19
Wheel Bolt R eplacem ent...................................................................................................................................... 4B-19
Bearing A d ju s tm e n t...............................................................................................................................................4B-19
Pinion Oil Seal/Companion Flange Replacement
93 / 4 - 1 0 1 / 2 -lnch Ring Gear-Full Floating A x le s )...........................................................................................4B-20
(
Axle Vent Replacement (12-Inch Ring Gear-Full Floating A x le ) .................................................................4B-21
Axle Shaft Replacement (12-Inch Ring Gear-Full Floating A x le ).................................................................4B-21
Bearing Adjustm ent (12-Inch Ring Gear-Full Floating A x le ) ....................................................................... 4B-21
Drive Pinion Oil Seal Replacement (12-Inch Ring Gear-Full Floating A x le )............................................. 4B-22
S pe cifica tio ns..............................................................................................................................................................4B-24
Special T o o ls ..............................................................................................................................................................4B-25
SECTION 4B
REAR AXLE
CONTENTS
81 / 2 - 91 / 2 -inch Ring Gear-Semi-Floating A xles)................................ 4B-13
81 / 2 - 9 V 2 -lnch Ring Gear-Semi-Floating A x le s )................................................4B-14
93 / 4 - 1 0 1 / 2 -lnch Ring Gear-Full Floating A x le s )..................................................4B-16
93 / 4 - 1 0 1 / 2 -lnch Ring Gear-Full Floating A x le s ) ......................4B-17
93 / 4 - 1 0 1 / 2 -lnch Ring Gear-Full Floating A x le s ) .................................4B-18
4B-1
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