Pontiac FIREBIRD 1972 Service Manual page 363

NON TYPE C SAFE-T-TRACK DIFFERENTIAL 4B-7
6. Examine ring gear and drive pinion teeth for nicks,
burrs or scoring. Any of these conditions will require
replacement of gear set.
7. Position ring gear on case and check fit of gear on
flange and pilot. It should be .002" tight to .001"
loose. If ring gear easily falls into position, it must be
replaced.
NOTE: I f ring gear is replaced, pinion gear
must also be replaced as they are only serviced
in matched sets.
8. Check press fit of side bearing inner race on differen-
tial case. Side bearings must be a tight press fit on
hub.
9. Inspect clutch plates for scored, worn, cracked or a
distorted condition. If any of these conditions exist,
new clutch plates must be installed.
10. Replace parts as necessary and coat withclean engine
oil before installing in case.
A AND B SERIES (2 pinion or 4 pinion) AND G
SERIES ( 4 pinion)
1. Make certain all parts are absolutely clean and dry.
2. Inspect pinion shaft, pinion and side gears, brake
cone surfaces and corresponding cone seats in case.
- - -
Fig. 48-8 Installing Differential Side Bearing
The cone seats in case should be smooth and free of
any excessive scoring. Slight grooves or scratches,
indicating passage of foreign material, are permissible
and normal. The land surface on the heavy spirals of
male cones will duplicate case surface coridition. Re-
place any parts which are excessively scored, pitted
or worn. Both halves of case must be replaced if one
half is damaged or worn.
DIFFERENTIAL CASE
-
ASSEMBLE
-
B SERIES ( 0
CODED AXLE)
1. After making sure that matching surfaces are clean
and free of burrs, position ring gear on case so holes
are in line.
2. Lubricate attaching bolts with clean engine oil and
install.
CAUTION: Do not use hammer to force ring
gear on case.
3. Pull ring gear onto case by alternately tightening
bolts around case. When all bolts are snug, tighten
bolts evenly and alternately across diameter to 90 Ib.
ft. torque.
4. If side bearings were removed, lubricate the bearings
and install on case hubs, as shown in Fig. 4B-8, using
tool J 22761.
5. Apply special lubricant to the clutch plates.
6. Assemble the clutch packs as follows:
a. Alternately position nine clutch plates on the side
gear, starting and ending with a clutch plate hav-
ing external lugs.
b. Install the two clutch guides over the clutch plate
lugs.
c. Install the same shims which were removed, or an
equal amount, on the clutch plate.
d. Repeat steps a, b, and c on the other clutch pack.
7. Check the pinion to side gear clearance as follows:
a. Install one side gear with clutch pack and shims
in the case.
,
b. Position the two pinion gears and thrust washers
on the side gear and install the pinion shaft.
c. Compress the clutch pack by inserting a screw-
driver or wedge between the side gear and the
pinion shaft.