Pontiac FIREBIRD 1972 Service Manual page 887

7D- 18 1972 PONTIAC SERVICE MANUAL
Fig. 7 D - 3 3 Checking Countershaft Gear End Play
19. Attach a dial indicator (Fig. 7D-33) and check end
play of the countershaft gear. If end play is greater
than .025", new thrust washers must be installed.
20. Install cage and the seventeen (17) bearing rollers
into main drive gear cavity, using heavy grease to
hold the rollers and cage in place.
21. Install main drive gear assembly through the case
cover opening and into position in transmission front
bore.
22. Install the 4th speed synchronizer blocker ring on
main drive gear with the notches toward the rear of
the transmission.
23. Place gasket in position on front face of rear bearing
retainer.
24. Position the front 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 main-
shafl assembly into case, slide the 3rd
&
4th
synchroniier sleeve forward into 4th speed de-
tent position (Fig. 770- 19).
25. Lower the mainshaft assembly into case, making cer-
tain that notches on the 4th speed synchronizer
blocker ring correspond to shifting plates in the 3rd
& 4th synchronizer assembly (Fig. 7D-34).
26. 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.
27. From rear of the case, insert the rear reverse idler
gear, engaging the splines with the portion of the
front gear inside the case.
Fig. 7 0 - 3 4 Installing Mainshaft Assembly
28. Using heavy grease, place gasket in position on rear
face of rear bearing retainer.
29. Install the remaining flat thrust washer on reverse
idler shaft. If new idler shaft is being used, drive out
the lock pin and press it into new shaft.
30. Install reverse idler shaft (with lock pin) and thrust
washer into idler gears and boss of case. Make sure
to pick up front tanged thrust washer.
NOTE: Lock pin should be in a vertical posi-
tion.
31. 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 (re-
verse detent position). Start the extension onto the
transmission case (Fig. 7D-33, 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, permitting the extension to
slide into the tralismission case.
Fig. 7D-35 Installing Rear Extension To Case