Pontiac FIREBIRD 1972 Service Manual page 387

4D-6 1972 PONTIAC SERVICE MANUAL
Fig. 40-6 Removing Clutch Pack
sembly. Clutch packs and side gears are removed by
tapping as shown in Fig. 4D-6.
NOTE: Keep the clutch plates and discs in their
ongnal location in the clutch pack.
9. Remove the clutch pack guides and separate the
clutch discs and plates from the side gears.
DISASSEMBLY
-
BRAKE CONE TYPE
1. Remove side bearings and ring gear as described in
Section 4B.
2. Scribe mark or paint differential case halves (see Fig.
4D-7) to aid in alignment of case when assembling.
3. Remove differential case half attaching bolts.
NOTE: Shims are used in some units between
the side gear and cone to maintain proper back-
lash between pinion gears and side gears. Keep
these parts with cap half of case a h disassem-
bly
4. Lift cap half of case from flange half. Remove clutch
cone, side gear, spring block, preload springs and
shims, if included (see Fig. 4B-2).
Fig. 40-7 Paint on Alignment Marks Before Disassembly
5. Remove corresponding parts from flange half of case
and keep them with flange half of case assembly.
CLEANING AND INSPECTION
1. Make certain that all differential parts are absolutely
clean and dry. Contamination may result in differen-
tial chatter.
2. Inspect pinion shaft, pinion and side gears. Replace
any parts which are excessively scored, pitted or
worn.
3. In units which use clutch packs, inspect clutch discs
and plates for worn, cracked or distorted condition.
If any of these defects exist, new clutch packs must
be installed.
4. In units of cone construction, inspect brake cone sur-
faces and corresponding cone seats in case. The cone
seats in the case should be smooth and free of any
excess scoring. Slight grooves or scratches, indicating
passage of foreign material, are permissable and nor-
mal. The land surface on the heavy spirals of male
cones will duplicate case surface condition. Should
any parts be excessively scored, pitted or worn, re-
placement of the entire case assembly will be re-
quired, as parts are matched sets within each
individual case and are not serviced separately.
ASSEMBLY
-
CLUTCH PACK TYPE
1. Lubricate clutch plates and discs with special positive
traction lubricant. (GM Part No. 1051022 or equiva-
lent).