Pontiac FIREBIRD 1972 Service Manual page 884

FOUR-SPEED MUNCIE TRANSMISSION 7D- 15
2. Using Tool J 6399, drive bushing forward into rear
extension (Fig. 7D-27).
3. Drive new bushing in from rear of extension with
same tool (J 6399), until end of bushing is slightly
below counterbore for oil seal.
4. Coat I.D. of bushing with transmission oil, new seal
with sealing compound and start straight into bore of
extension. Using Installer J 5 154-A, tap seal into ex-
tension (Fig. 7D- 13).
CAUTION: Do not excessively force the seal
against the seat in the extension.
SYNCHRONIZER ASSEMBLIES
DISASSEMBLE A N D ASSEMBLE
Fig. 7D-26 Installing Reverse Shifter Shaft and Detent Ball
5. Place detent ball on spring and, holding ball down
with a suitable tool, push shifter shaft into place and
turn until ball drops into place in detent on the shifter
shaft (Fig. 7D-26).
6. Install reverse shift fork.
NOTE: Do not d i v e the shifter shaft lock pin
into place until the rear extension has been in-
stalled on the transmission case.
REAR EXTENSION BUSHING AND OIL
SEAL
REMOVE A N D REPLACE
1. Remove oil seal with punch or other suitable tool and
discard seal (Fig. 7D-12).
NOTE: The synchronizer hubs and their sleeves
are a selected assembly and should be kept
together as originally assembled, but the three
shifting plates and two springs may be replaced
if worn or broken.
Mark synchronizer hub and sleeve so they can be
reassembled in the same position.
Push the hub from its sleeve. The shifting plates will
fall free and their springs may be easily removed.
Place the two springs in position (one on each side of
the hub), so a tanged end of each spring falls into the
same keyway in the hub. Place the shifting plates in
position and, holding them in place, slide the hub into
the sleeve.
TRANSMISSION
CLEANING A N D INSPECTION
1. Wash the transmission case inside and out with a
cleaning solvent and inspect for cracks. Inspect the
front face, which fits against clutch housing, for
burrs. If any are present, dress them off with a fine
cut mill file.
2. Wash the clutch gear bearing and the rear bearing
thoroughly in cleaning solvent and blow out bearings
with compressed air.
CAUTION: Do not allow the bearings to spin;
turn them slowly by hand. Spinning bearings
will damage the race and balls.
Fig. 7 0 - 2 7 Removing or Installing Rear Extension Bushing
3. Make sure the bearings are clean, then lubricate them
with light engine oil and check them for roughness.