Standard Differential; Axle Ratios - Pontiac Grand Prix Service Manual

STANDARD DIFFERENTIAL
CONTENTS OF THIS SECTION
SUBJECT PAGE SUBJECT PAGE
Axle Ratios
. . . . . . . . . . . . . . . . . .
.4A- 1
. . . . .
New C a r Pre-Delivery Inspection. .4A-2
Periodic Service
. . . . . . . . . . . . . . .
.4A-2
Minor Service and Repairs.
. . . . . . . . .
.4A-8
Companion Flange-R & R
. . . . . . . . .
,4A-8
. . . . . .
Pinion Bearing Oil Seal-R & R
.4A-9
Axle Shaft, Axle Shaft Bearing, Bearing Oil
. . . . .
Seal and/or Wheel Bolt-R & R
.4A-9
Major Repairs
. . . . . . . . . . . . . . . .
.4A- 11
Rear Axle Assembly
. . . . . . . . . . .
. 4 A - l l
. . . . . . . . . .
Pre-Repair Investigation .4A- 12
Gear Tooth Nomenclature
. . . . . . . .
.4A- 12
Red Lead T e s t
. . . . . . . . . . . . . .
.4A- 12
Effects of Increasing Load on Tooth
. . . . . . . . . . . . .
Contact Pattern .4A- 13
. .
Adjustments Affecting Tooth Contact
.4A- 13
Effects of Backlash on Tooth Pattern.
. .
4A- 14
Effects of Pinion Position on Tooth
Pattern.
. . . . . . . . . . . . . . . . .
.4A- 14
AXLE RATIOS
Eleven different axle ratios are available for the
various car models, Fig 4A-4A. They can be identified
by the code stamepd on the rear of the L.H.
axle tube
adjacent to the carrier (Fig. 4A-1).
Fig. 4A-1 Rear Axle View
-
Pontiac, Tempest and
Grand Prix
. . . . . . . . . . . .
Overhaul Differential .4A- 14
. . . . . . . .
Remove Differential Case .4A- 14
. . . . . .
Disassemble Differential Case .4A- 15
. . . . . . . . .
Cleaning and Inspection. .4A- 17
Assemble Differential Case
. . . . . . .
.4A- 17
Remove Pinion Assembly.
. . . . . . . .
.4A- 18
Disaesemble Pinion Assembly
. . . . . .
.4A- 18
Cleaning and Inspection.
. . . . . . . . .
.4A- 18
Replace Pinion Bearing Outer
Races
. . . . . . . . . . . . . . . . . . .
.4A-19
. . . . . . . . . . . .
Setting Pinion Depth -20
Replace Pinion Assembly and Adjust
Pinion Preload
. . . . . . . . . . . . .
.4A-22
Replace Differential Caee and Adjust
. . . . . . . . . .
Side Bearing Preload. 4A-23
Adjusting Differential Backlash
. . . . . .
.4A-25
Oil Leaks
. . . . . . . . . . . . . . . . .
.4A-26
Specifications
. . . . . . . . . . . . . . . . .
.4A-26
Special Tools
. . . . . . . . . . . . . . . . . .
4A-27
Three different cases, which differ in ring gear
mounting dimensions, arc 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 AND FIREBIRD
Nine different axle ratios are available for the various
car models, Fig. 4A4B and 4A4C. They can be
identified by the code stamped on the rear of the
L . H .
axle
tube adjacent to the carrier
(Fig.
4A-l), 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.
GRAND PRlX
Six ratios are available for the Grand Rix: 2.93, 3.08,
3.23,3.36,3.55 and 3.90.They can be identified by the code
stamped on the rear of the L.H. axle tube
adjacent
to
the carrier
(Fig.
4A-l), or on the left rear brake drum
suiface.
Three different
cases,
which differ in ring gear