4A-1
STANDARD
DIFFERENTIAL
CONTENTS
OF
THIS
SECTION
SUBJECT
PAGE
Axle
Ratios 4A-1
New Car Pre-Delivery Inspection 4A-1
Periodic
Service 4A-2
Minor
Service and Repairs
Companion Flange—R & R 4A-2
Pinion
Bearing Oil Seal-R & R . . . . 4A-7
Axle
Shaft, Axle Shaft Bearing,
Bearing
Oil Seal and/or
Wheel
Bolt-R & R . . . 4A-8
Major
Repairs
Removal
and Installation of
Rear
Axle
Assembly . 4A-10
Remove Differential 4A-11
Pre-Repair
Investigation 4A-11
Gear
Tooth Nomenclature 4A-11
Red
Lead
Test 4A-11
Effects
of Increasing
Load
on
Tooth Contact Pattern . . 4A-12
Adjustments Effecting Tooth Contact . 4A-12
Effects
of Backlash on Tooth Pattern . 4A-13
Effects
of Pinion Position on
Tooth Pattern .
............
4A-13
SUBJECT
PAGE
Overhaul
Differential
Remove Differential Case 4A-13
Disassemble Differential Case . . . . 4A-14
Cleaning
and Inspection 4A-15
Assemble Differential Case 4A-15
Remove Pinion Assembly 4A-16
Disassemble Pinion Assembly 4A-17
Cleaning
and Inspection 4A-17
Install
Pinion Bearing Outer Races . . 4A-17
Setting Pinion Depth 4A-18
Install
Pinion Assembly and Adjust
Pinion
Preload 4A-20
Install
Differential Case and Adjust
Side Bearing Preload 4A-21
Adjusting
Differential Backlash . . . . 4A-22
Oil
Leaks
. 4A-23
Specifications . . . 4A-23
Special
Tools 4A-25
AXLE
RATIOS
PONTIAC
(Fig.
4A-4A)
Eleven
different axle ratios are available for the
various car
models.
They can be identified by the
code
stamped on the rear of the L.H. axle
tube
adjacent to the
carrier
(Fig. 4A-1).
Three
differential cases, which differ in ring gear
mounting dimensions, are used: one for 2.29, 2.41
and
2.56 ratios, one for the 2.73, 2.93 and 3.08
ratios and one for the 3.23, 3.42, 3.55, 3.73 and
4.11 ratios. When changing axle ratios, be sure to
use the proper differential case.
TEMPEST--(Fig.
4A-4B)
AND
FIREBIRD—(Fig.
4A-4C)
Nine different axle ratios are available for the
various car
models.
They can be identified by the
code
stamped on the rear of the
L.H.
axle
tube
ad-
jacent to the
carrier
(Fig. 4A-1), or on the
left
rear
brake
drum surface. Three differential cases, which
differ in ring gear mounting dimensions, are used:
one for 2.56 and 2.78 ratios, one for 2.93, 3.08 and
3.23 ratios and one for 3.36, 3.55, 3.90 and 4.33
ratios. When changing axle ratios, be sure to use
the proper differential case.
NEW
CAR
PiE-DELlVERY
INSPECTION
TORQUE
Check
torque specifications at rear axle.
1. Tighten all rear suspension control arm
bolts
to 110 lb. ft. torque and nuts to 80 lb. ft. torque
(Pontiac and Tempest).
2. Tighten rear shock absorber to axle housing
nut to 65 lb. ft. torque and shock absorber to frame
bolt
to 20 lb. ft. torque.
AXLE
RATIO
IDENTIFICATION
Fig.
4A-1
Rear
Axle
View
-
Pontiac
and
Tempest
3.
Tighten universal joint U-bolt nuts to 12 lb. ft.
torque (with lock plates) or 17 lb. ft. torque (with
lock washers).
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