3-Speed Saginaw Transmission - Chevrolet 1973 Overhaul Manual

3-SPEED SAGINAW TRANSMISSION

Disassembly of Transm ission............................................. ...7M-7
Disassembly of Mainshaft .................................................. ...7M-7
Cleaning and Inspection ........................................................7M-7
Transmission C a se..................................................................7M-7
Front and Rear Bearings ...................................................7M-9
Bearing Rollers .......................................................................7M-9
Gears ...........................................................................................7M-9
Reverse Idler Gear Bushing ..............................................7M-9
DISASSEMBLY OF TR ANSM ISSIO N
1. Remove side cover attaching screws and remove
side cover assembly and shift forks.
2. Remove drive gear bearing retainer.
3. Remove drive gear bearing to gear stem snap ring,
then remove drive gear bearing by pulling outward
on gear until a screw driver of other suitable tool
can be inserted between bearing large snap ring
and case to complete removal. The drive gear
bearing is a slip fit on the gear and into the case
bore. (This provides clearance for removal of drive
gear and mainshaft assembly.)
4. Remove extension to case attaching bolts.
5. Remove the reverse idler shaft "E" ring.
6. Remove drive gear, m ainshaft and extension
assembly together through the rear case opening.
Remove clutch drive gear, needle bearings and
synchronizer ring from m ainshaft assembly.
7. Using snap ring pliers, expand the snap ring in the
extension which retains the m ainshaft rear bearing
(fig. 2A) and remove the extension.
8. Using J-22246 at the front of the countershaft,
drive the shaft and its woodruff key out the rear of
the case. Tool J-22246 will now hold the roller
bearings in position within the countergear bore.
Remove the gear, bearings and thrust washers.
9. Use a long drift or punch through the front bearing
case bore and drive the reverse idler shaft and
woodruff key through the rear of the case (fig. 3A).
NOTE: The truck 3-speed Saginaw manual
transmission uses a different reverse idler
gear shaft than passenger car models. The
passenger car model idler shaft has the
retaining ring groove at the center of the
shaft whereas the truck model shaft has the
CLUTCHES A N D M A N U A L T R A N S M IS S IO N S
INDEX
Countergear Anti-Lash P la te ..............................................7M-9
Repairs ........................................................................................ ...7M-10
Clutch Keys and S p rin g ......................................................7M-10
Extension Oil Seal or B u sh ing.........................................7M-10
Clutch Bearing Retainer Oil S e a l....................................7M-11
Assembly of Mainshaft ...........................................................7M-11
Assembly of Transm ission......................................................7M-11
groove relocated off- center and further away
from the gear. A spacer is released in
conjunction with the truck model shaft to fit
between the retaining ring and idler gear to
keep the gear from moving axially. The truck
model shaft and spacer unit will be used to
service all models.
DISASSEMBLY OF M A IN SH A FT
1. Using snap ring pliers, remove the 2nd and 3rd
speed sliding clutch hub snap ring from m ainshaft
and remove clutch assembly, second speed blocker
ring and second speed gear from front of
mainshaft.
2. Depress speedometer retaining clip and slide gear
from mainshaft.
3. Remove rear bearing snap ring from m ainshaft
groove.
4. Support reverse gear with press plates and press on
rear of m ainshaft to remove reverse gear, thrust
washer, spring washer, rear bearing, and snap ring
from rear of m ainshaft.
5. Remove the 1st and Reverse sliding clutch hub snap
ring from the m ainshaft and remove the clutch
assembly, 1st speed blocker ring and first speed
gear from rear of the m ainshaft.
This completes the disassembly of the mainshaft.
CLEANING AND INSPECTIO N
Transmission Case
1. Wash the transmission thoroughly inside and
outside with cleaning solvent, then inspect the case
for cracks.
2. Check the front and rear faces for burrs, and if
present, dress them off with a fine mill file.
3. Check bearing bores in case and, if damaged,
replace case.
7 M -7
OVERHAUL MANUAL