Pontiac tempest 1968 Service Manual page 124

4 A - 1
STANDARD DIFFERENTIAL
C O N T E N T S OF T H I S S E C T I O N
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 S e a l - R & R . . . . 4A-7
Axle Shaft, Axle Shaft Bearing,
Bearing Oil Seal and/or
Wheel B o l t - R & R . . .
4 A - 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
F i g . 4 A - 1 Rear Axle V i e w - 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).