Pontiac FIREBIRD 1972 Service Manual page 867

7C- 10
1972 PONTIAC SERVICE MANUAL
1. Install 3rd speed gear with clutching teeth upward;
rear face of gear will butt against the flange on the
mainshaft.
2. Install a blocker ring with clutching teeth downward
over synchronizing surface of the 3rd speed gear.
NOTE: All 4 blocker rings in the transmission
are the same and interchangeable.
3. Install 3rd and 4th synchronizer assembly with the
fork slot downward, pressing it onto splines on the
mainshaft until it bottoms out (Fig. 7C-20).
CAUTION: Be sure the notches of the blocker
ring align with the keys of the synchronizer
assembly.
4. Install 3rd and 4th synchronizer snap ring. Both syn-
chronizer snap rings are the same.
5. Turn the rear of the mainshaft upward and install
2nd speed gear with clutching teeth upward; front
face of gear will butt against the flange on the main-
shaft.
6. Install blocker ring with clutching teeth downward
over synchronizing surface of the 2nd speed gear.
7. With fork slot downward, press 1st and 2nd synchro-
nizer assembly onto splines of mainshaft (Fig. 7C-
2 1).
Fig. 7 C - 2 0 Installing 3rd and 4th Synchronizer and 3rd
Speed Gear
Fig. 7 C - 2 1 Installing 1st and 2 n d Synchronizer and 2nd
Speed Gear
CAUTION: Be sure notches of blocker ring
align with keys of synchronizer assembly.
Install 1st and 2nd synchronizer snap ring.
Install blocker ring with notches downward so they
align with keys of 1st and 2nd synchronizer assembly.
Install 1st speed gear with clutching teeth downward.
Install 1st speed gear thrust washer (steel) and spring
washer.
With snap ring slot upward, press rear bearing onto
mainshaft (Fig. 7C-22).
Install rear bearing snap ring (Fig. 7C-14).
Place speedometer gear retainer in output shaft.
Align slot in speedometer drive gear with retainer
clip and slide gear into place.
Install Countershaft Alignment Tool J 22246 into
countergear.
From each end of countergear, install 27 bearing roll-
ers and. a bearing thrust washer (Fig. 7C-19).
NOTE: Coat bearing rollers with heavy grease
before installing.
Install countergear-to-case tanged thrust washer
(tang away from gear) at each end of countergear.