Pontiac FIREBIRD 1972 Service Manual page 360

4B-4 1972 PONTIAC SERVICE MANUAL
NOTE: Continued spinning may cause a whir-
1
ring sound due to the overrunning brake cones
(A & G Series, '7"' coded axles and B Series,
"B" coded axles) lacking suficient lubricant.
Such a condition or sound does not indicate
failure of the unit.
LUBRICATION
The differential should be checked for leaks every 6000
miles. No periodic lubricant change is recommended.
However, if necessary to add lubricant, use only specially
formulated lubricant for Safe-T-Track differentials
-
GM
Part Number 1051022 or equivalent.
CAUTION: Never use any other lubn'cant in a
Safe- T- Track differential or a severe chatter
may result, especially when turning corners.
If the wrong lubricant is added, drain it from housing and
flush with special lubricant, and refill the unit. It may be
necessary to drive the car several miles to allow the lubri-
cant to work through the clutches and eliminate the chat-
ter. If chatter persists, drain and refill again to eliminate
contamination. It may require 2 or 3 flushings to correct.
An alternate procedure is disassembly and cleaning with
solvent.
SERVICE PROCEDURES
NOTE: Service procedures for the two and four
pinion cone type differential case used in A and
G Series models is presented for infomation
SERVED WHEN WORKING ON ALL CARS WITH
only or in the event that cleaning of component
SAFE-T-TRACK DIFFERENTIALS:
parts should be necessary. The case assembly of
the cone type differential is a non-serviceable
1. NEVER raise one wheel and run the engine with the
item and must be replaced as a unit.
transmission in gear. The driving force to the wheel
on the floor will cause the car to move.
All rear axle service procedures are the same for the Safe-
T-Track as for the conventional differential, provided they 2. Do not use "on the car" type wheel balancers on the
have the same last letter in the three letter axle code, rear wheels, unless BOTH wheels are off the floor.
except for servicing the case assembly. See Section 10.
MAJOR REPAIRS
DIFFERENTIAL CASE
5. Inspect fit of inner races on case hubs by prying
against shoulders at puller recesses. Bearing inner
DISASSEMBLE
-
B SERIES (0 CODED AXLE) races must be tight on case hubs.
NOTE: Keep side bearing outer races with side
bearings, so these matched parts can be cor-
rectly replaced during build-up.
1. Before disassembling differential case, inspect differ-
ential side bearings for visible damage of rollers and
outer races.
2. Place one outer race onto its matched inner race and
roller assembly and turn slowly, applying hand load.
3. If bearing outer race turns smoothly and no visible
damage is found, bearing can probably be reused.
4. Repeat above operations with other outer race and
matched bearing and check for smoothness.
NOTE: Both side bearings and their races are
matching parts. If either bearing is to be re-
placed, its matching outer race must also be
replaced.
NOTE: If either is loose on case, the entire case
must be replaced.
CAUTION: When removing side bearings make
certain ends ofpuller arms are finny seated in
recesses in sides of hubs and fully against inner
race of bearing.
6. If bearing inspection indicates that bearings should
be replaced, insert differential case in vise and, using
side bearing puller J 8 107 remove side bearing (Fig.
4B-4).
7. Turn differential' case in vise and remove other side
bearing in same manner.
NOTE: Ring gear to case bolts have left hand
threads.
8. If removing ring gear, clamp case in vise so jaws are
90" to pinion shaft holes and remove ring gear retain-
ing bolts.