Effect On Pattern; Removing Difterential Case - Pontiac Grand Prix Service Manual

STANDARD DIFFERENTIAL 4A-15
TOE
HEEL HEEL
DRIVE SIDE COAST SIDE
(CONVEX) (CONCAVE)
Fig. 4A-21 Tooth Pattern - Pinion Too Close to Ring
Gear (Shim Thickness Excessive)
checks under pre-repair investigation have been
completed.
1. With rear wheels off floor, rotate rear wheels and tap
brake backing plates with a soft hammer to ensure that
brakes are free.
2. Remove both axle shafts.
3. Remove U-bolts which hold rear universal joint to
companion flange. Use a heavy rubber band or tape to
hold bearings onto journal to prevent loss of bearing
rollers when joint is disconnected if tie wire has been
removed (Fig. 4A-5).
4. Thoroughly clean differential housing cover and
surrounding area of axle housing to avoid dirt entering
housing or falling on the gears.
5. Drain oil by loosening all cover attaching bolts and
then break loose cover about 1 /8".
6. Allow oil to drain thoroughly, then remove attach-
ing bolts and cover from housing.
TOE
HEEL HEEL
DRIVE SIDE COAST SIDE
(CONVEX) (CONCAVE]
7. Remove the four bearing cap bolts and reinstall
bearing caps, using four (7l.16"-14 x 4 1!2") bolts
finger tight as a safety precaution.
NOTE: Bearing caps are not marked for identification.
Use daub of paint to identiB, as the caps are not
interchangeable.
8. Pontiac-Remove two ring gear to case assembly
bolts. Install ring gear and case remover 521322, left
hand bolt and sleeve set J 22042 and slide hammer J
26 19 (Fig. 4A-23).
NOTE: Ring gear to case bolts have lefi hand threads.
Tempest, Firebird and Grand Prix - Remove two ring
gear to case bolts. Install ring gear and case remover J
2 1322 and slide hammer J 26 19 (Fig. 4A-23).
NOTE: Attach remover J 21322 to case and ring gear
by using two Y 8"-24 x 1 K 8" bolts.
9. Loosen case from housing with slide hammer until it
falls free. Safety bolts installed in siep 1 will catch
assembly.
10. Support case assembly in one hand and remove
safety bolts. CAREFULLY remove case so as not to let
bearing races or shims fall from housing.
NOTE: Place right and lefr bearing outer race and shim
in sets with marked bearing caps. Measure thickness of
each shim and record.
DISASSEMBLE
1. All models except where noted before disassembling
differential case, inspect differential side bearings for
visible damage of rollers and outer races.
2. Place one outer race onto its matching inner race
and roller assembly and turn slowly, applying hand
load.
Fig.
4A-22
Effect on Pattern
-
As Shim
Decreased
Fig.
4A-23
Removing Difterential Case