Chevrolet 1977 10 Series, Repair Manual, Page: 408 / 468

7B-28
OVERHAUL MANUAL
1. Drive Gear Bearing
2. Drive Gear
3. Mainshaft Pilot
Bearings
4. 3-4 Synchronizer
AssenWy
5. Third Speed Gear
6. Second Speed Gear
7. 1-2 Synchronizer and
Reverse Gear Assembly
8. First Speed Gear
9. Thrust Washer
10. Spring Washer
11. Rear Bearing
12. Speedo Drive Gear
13. Mainshaft
14. Snap Ring
15. Synchronizing
“ Blocker” Ring
Fig. 7B-1
6
J - C lu tc h G ear and M a in s h a ft D e ta ils
9. Install a blocker ring with notches downward so they
align with the keys of the 1-2 synchronizer assembly.
10. Install first gear with clutching teeth downward.
11. Install first gear th ru st washer (steel).
Fig. 7B -17J —Installing Rear Bearing
CAUTION:
Be sure the notches o f the blocker ring
align with the keys o f the synchronizer assembly.
12. Install first gear spring washer.
13. Install rear ball bearing with snap ring slot
downward; press onto m ainshaft (Fig. 7B-17J).
14. Install rear bearing to m ainshaft snap ring (Fig. 7B-
8J).
15. Install speedometer drive gear and clip.
This completes the assembly of the mainshaft.
ASSEMBLY OF TR A N SM ISSIO N (Fig. 7B-18J)
1. Using Tool J-22246 load a row of roller bearings (27)
and a bearing thrust washer at each end of the countergear.
Use heavy grease to hold them in place (Fig. 7B-19J).
2. Place countergear assembly through case rear opening
along with a tanged thrust washer (tang away from gear) at
each end and install countergear shaft and w oodruff key from
rear of case.
CAUTION:
Be sure countershaft picks up both
thrust washers and that the tangs are aligned with
their notches in the case.
3. Install reverse idler gear and shaft with its w oodruff
key from the rear of case.
4. Using snap ring pliers, expand the snap ring in the
extension and assembly extension over rear of mainshaft and
onto rear bearing. Seat snap ring in rear bearing groove (Fig.
7B-4J).
5. Load the m ainshaft pilot bearings (14) into the clutch
gear cavity and assemble the 4th speed blocker ring onto the
clutch gear clutching surface with its clutching teeth toward
the gear (Fig. 7B-20J).
6. Pilot the clutch gear, pilot bearings and 4th speed
blocker ring assembly over the front of the mainshaft
assembly. Do not assemble bearing to gear yet.