Periodic Service - Pontiac FIREBIRD 1972 Service Manual

NON TYPE C DIFFERENTIAL 4A- 1 1
,
level to bottom of filler plug hole. (A, G , F and X vehi-
the importance of using factory recommended lubricant,
cles). On B Series vehicles, lubricant may be flush to 3/4"
,
a container of this lubricant is furnished with each service
below filler plug on P and M coded axles, and flush to ring gear and pinion set or differential carrier assembly.
3/8" below filler plug on B, G , K and 0 coded axles.
This lubricant is also available through regular parts chan-
nels. See Section 4B SPECIFICATIONS for Safe-T-Track
Lubricant Recommendations.
PERIODIC SERVICE
LUBRICATION
,
SHOCK ABSORBERS
Lubricant change in the differential is not recommended
unless repair work is being done. The differential should Give visual inspection for leaks and jounce car at each
be checked for leaks at each chassis lubrication. If there lubrication period to see that shock absorbers are in an
is evidence of leakage, the leak should be corrected and operative condition. If inoperative or if leaks are found,
lubricant added if needed. Use MPG SAE 80 or 80-90 sefer to suspension section of manual and thoroughly
(GL-5) lubricant in the standard differential. Because of diagnose problem before replacing units.
MINOR SERVICE AND REPAIRS
CAUTION: Use care not to crush exhaust sys-
1. With rear wheels off floor, turn wheels and tap brake
tern 'ilick-under7'pipe on B Series station wag-
backing plates with a soft hammer to ensure that
o m when using an axle engaging hoist.
brakes are free.
Most rear axle service repairs can be made with the rear
CAUTION: Use care not to crush exhaust sys-
axle assembly in the car by raising the rear end, with the
tern "kick-under" pipe on B Series station wag-
rear axle hanging on the shock absorbers. Rear axle lubri-
ons when using an axle engaging hoist.
cant may bedrained by backing out all cover bolts and
breaking cover loose at the bottom.
2. Remove bolts which hold rear universal joint to com-
panion flange. Use a heavy rubber band or tape to
COMPANION FLANGE
hold bearings onto journal to prevent loss of bearing
rollers when joint is disconnected if tie wire has been
removed (Fig. 4A-6).
REMOVE
3. Additional clearance to check preload can be ob-
tained between differential and body by raising body
a few inches by means of a jack or stand placed under
frame at rear.
NOTE: When replacing companion flange, it is
important that new flange be properly installed 4. Attach a 1/2" drive adapter and socket to a lb. in.
to provide correct pinion bearing preload. The torque wrench. Place socket over drive pinion nut
following procedure must be used to ensure and turn pinion two or three revolutions to ensure
correct pinion bearing adjustment: free movement. Then take a torque reading while
rotating pinion to measure bearing preload (Fig.
r
1
4A-7). Record reading.
Fig. 4A-6 Bearings Held in Place by Tie Wire
Fig. 4A-7 Checking Pinion Bearing Preload