Cadillac 60 Series 1963 Shop Manual page 152

PROPELLER SHAFT A N D REAR AXLE
7-3
During normal driving and cornering, the Con-
trolled Differential unit functions as a standard
differential. When one wheel encounters a slip-
pery surface, however, the Controlled Differential
allows the wheel with the greater traction to drive
the car.
Wheelspin can occur if over-acceleration is
attempted. However, the major driving force will
still be directed to the other wheel. This condition
does not indicate failure of the unit.
When checking the runout of rear wheels on
cars equipped with a Controlled Differential, be
sure to raise both rear wheels off the ground.
Otherwise, the wheel in contact with the ground
will drive when the opposite wheel is raised and
rotated.
Cars equipped with the Controlled Differential
should use only the special lubricant available
from factory Parts Warehouses to assure satis-
factory operation of this unit.
All service information in this section applies
to the controlled as well as the standard differ-
ential carrier assemblies, unless otherwise noted.
Both of these differentials are serviced as
assemblies.
SERVICE INFORMATION
1. Rear Axle Gear Ratio Identification
The gear ratio of the rear axle assembly on
1963 series Cadillac cars can be determined by
an identification number stamped on the front face
of the carrier assembly at the end of the oil re-
turn passage, Fig. 1-1.
In the case of a controlled differential, the
letter " G " precedes the axle ratio identification
number. For example; "G2" is a controlled dif-
ferential with a rear axle gear ratio of 2.94-1.
The serial number of the differential carrier is
stamped on the bottom of the carrier on the flange
adjacent to the rear axle housing.
The gear ratios and corresponding identification
numbers for the various series are as follows:
Series
1963 - 60 & 62 series
(except cars equipped
with an Air Conditioner)
1963 - 60 & 62 series
cars when equipped
with an Air Conditioner,
(optional on all 60 & 62
series cars)
1963 - 75 series cars
1963 - Commercial
Chassis (Optional on
75 series cars)
Ratio
2.94-1
3.21-1
3.36-1
3.77-1
Identification
Number*
2
1
6
7
*Letter"G" preceding the identification number
indicates a controlled differential.
2. Rear Axle Pinion Flange and Oil Seal
Removal and Installation (60
and 62 Series)
When replacing the rear axle pinion flange or
oil seal, follow the procedure outlined below.
Failure to do so may result in overloaded pinion
bearings or drive pinion end play.
a. Removal
1. Raise rear end of car, and remove both rear
wheels and brake drums to eliminate drag when
measuring torque readings.
2. Disconnect rear universal joint from pinion
flange.
3. Using a Q-100 inch-pound torque wrench,
with Socket, J-2571-1, and Adapter, J-2571-2,
measure the inch-pounds torque required to ro-
tate the pinion shaft slowly for at least 2 turns,
Fig. 7-3. Record torque reading.
Fig. 7-3 Checking Pinion Shaft Pre-load Torque
(60 and 62 series cars)