Pontiac firebird 1968 - Page 432

FOUR SPEED MUNCIE MANUAL TRANSMISSION
7D-13
6. Attach a dial Indicator as shown in Fig, 7D-24
and check end play of the countergear. If end play
is greater than .025", new thrust washers must be
installed.
Fig. 7D-24 Checking Countergear End Play
7. Install cage and the seventeen roller bearings
into main drive gear, using heavy grease to hold the
bearings and cage in place.
8. Install main drive gear and pilot bearings
through the side cover opening and into position in
transmission front bore.
9. Place gasket in position on front face of rear
bearing retainer.
10. Install the fourth speed synchronizing ring on
main drive gear with the notches toward the rear of
the transmission.
11. Position the reverse idler gear thrust washer
(tanged) on the machined face of the ear cast in the
case for the reverse idler shaft and hold with heavy
grease. Position the front reverse idler gear next
to the thrust washer, with the hub facing toward rear
of the case.
CAUTION: Before attempting to install mainshaft
assembly to case, slide the 3-4 synchronizing
clutch sleeve forward into fourth speed detent po-
sition (Fig. 7C-11).
12. Lower the mainshaft assembly Into case, mak-
ing certain notches on the fourth speed synchronizing
ring correspond to keys in the clutch assembly (Fig.
7A-25).
13. With the guide pin in rear bearing retainer
aligned with hole in rear of case, tap rear bearing
retainer into position with a soft hammer.
[Vv'.v CLUTCH' KEY'
NOTCH IN
SYNCHRONIZING
RING
Fig. 7D-25 Installing Mainshaft Assy.
14. From rear of the case, insert the rear re-
verse idler gear, engaging the splines with the
portion of the front gear inside the case.
15. Using heavy grease, place gasket in position
on rear face of rear bearing retainer.
16. Install the remaining flat thrust washer on
reverse idler shaft. If new Idler shaft is being used,
drive out the roll pin and press it into new shaft.
17. Install reverse idler shaft, roll pin and thrust
washer Into gears and front boss of case. Make sure
to pick up front tanged thrust washer.
NOTE: Roll pin should be in a vertical position.
18. Position reverse gear at rear of spline, pull
reverse shifter shaft to left side of extension and
rotate shaft to bring reverse shift fork forward in
extension (reverse detent position). Start the exten-
sion onto the transmission case (Fig. 7D-26), while
slowly pushing in on the shifter shaft to engage the
shift fork with the reverse gear shift collar. Then
pilot the reverse idler shaft into the extension hous-
ing, permitting the extension to slide onto the trans-
mission case.
19. Install 6 extension and retainer-to-case at-
taching bolts. Torque upper 3 bolts to 20 lb. ft.;
lower 3 bolts to 30 lb. ft.
20. Push or pull reverse shifter shaft to line up
groove in the shaft with holes in the boss and drive
in the lock pin. Install shifter lever.
21. Press front bearing onto main drive gear
(snap ring groove to front) and into case, until sev-