Plymouth Gran Fury 1980 Operating Instructions And Product Information page 63

Propeller Shaft Universal Joints
Universal joint seals should be inspected for externa l leaks or
damage whenever the car is serviced for other reasons. lf external
leaks or damage is evident, the universal joint shou ld be re-
placed. Relubrication is not recommended.
Rear Axles
Chrysler Corporation recommends that Multi-Purpose Gear Lu-
bricant, as defined by the American Petroleum Institute GL-5,
should be used in all rear axles.
Mopar Hypoid Lubricant
PIN
3744994 or 4-281 is an o il of thi s
type a nd is recommended.
Sure-Grip differentials require the use of a friction control addi-
tive. Mo par Hypoid Gear Oil Additive Friction Modifier,
PIN
4057100, is a materia l of this type and is recommended. This
s hould be added to Mopar Hypoid Lubricant whenever a fluid
change is made .
Caution
Whe n servicing the rear ax le, always elevate both rear wheels.
Do not rota te the axle b y use of the engine or other means unless
both rear w heels are elevated.
Frequency of Oil Change - Chrysler Corporation does not re-
commend regu larly scheduled o il changes for rear axles in vehi-
cles whose operation is classified as normal passenger car service,
unless the lubrican t has become contam inated with water or to
provide the co rrect viscosity grade for the anticipated tempera-
ture ranges as follows:
Anticipated
Temperature Range
As low as -30°F ( -34°C)
Below -30°F (-34°C)
Viscosity Range
SAE 90, SAE 85W-90,
SAE SOW-90
SAE SOW, SAE BOW-90
SAE 75W
The factory fill oil is satisfactory to -30°F (-34°C) temperature.
Fluid Level Check - For normal passenger car service, periodic
fluid level checks are not required. At each engine oil change
however, the exterior s urfaces of the axle assembly should be
inspected for ev idence of gear oil leakage. Check the fluid level if
leakage is suspected .
If the fluid level
is checked with the car in a level positio n ,
s upported by the s uspension, o n an axle or w heel type hoist or on
the ground, the fluid levels should be between the bottom of the
filler plug opening and a point
1 /2"
(12.7 mm) below the opening.
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