Chevrolet 70 1969 Series, Shop Manual

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TRANSMISSION AN D CLUTCH 7-29
5-SPEED CLARK TRANSMISSIONS
(MODEL 3 2 5 V , 327V )
TRANSMISSION OVERHAUL
GENERAL
IMPORTANT: Cleanliness is extremely impor­
tant and an absolute must when repairing or
overhauling the transmission. Before attempting
overhaul procedures, thoroughly clean the ex­
terior of the transmission with cleaning solvent
to prevent dirt from getting into the gear
mechanism.
NOTE: Clutch housing should not be removed
from transmission case unless housing or case
require replacement.
DISASSEMBLY OF TRANSMISSION
INTO SUBASSEMBLIES
AND MAJOR COMPONENTS
Key numbers in text refer to Figure IP unless otherwise
specified.
The following procedures cover complete overhaul of
the transmission. The transmission should be overhauled
in sequence described unless only one unit is to be worked
on.
CONTROL TOWER REMOVAL
NOTE: On transmissions having a conventional
gearshift lever, accomplish the following proce­
dures:
1. Move gearshift lever to “ N eutral” position.
2. Remove four bolts and lock washers attaching control
tower (12) to shift bar housing (14).
3. Lift shift control tower (12) straigh off shift bar
housing (14). Remove and discard tower to housing
gasket.
SHIFT BAR HOUSING REMOVAL
1. M ount transmission in holding fixture (J-5750); then
remove drain and filler plugs and completely drain the
transmission.
2. Remove power take-off covers and gaskets. Discard
gaskets.
3. Remove bolt and lock washer assemblies, then remove
the shift bar housing (14) and gasket from transmis­
sion case (fig. 2P). Discard gasket.
4. Shifting by hand, engage transmission into two speeds
at the same time to lock up the transmission.
MAINSHAFT REMOVAL
1. Remove parking brake parts (if used).
2. Remove nut and pull companion flange (and brake
drum, if used) from rear end of mainshaft (22).
3. Remove speedometer driven gear (29) and adapter (if
used) from the mainshaft rear bearing cap (25).
4. Remove bolt and lock washer assemblies, then remove
mainshaft and countershaft, rear bearing caps (25 and
30) and gaskets. Discard gaskets (24 and 33).
5. With transmission still locked in two speeds, remove
countershaft rear bearing retaining nut (31).
6. Remove clutch release bearing (1) and support assem­
bly (2) from main drive gear. Remove clutch release
yoke (48).
7. Remove four bolt and lock washer assemblies; then
remove main drive gear bearing cap and gasket (47).
Discard gasket.
8. Remove main drive gear and bearing assembly (5)
from front of transmission case. Use care as main­
shaft pilot bearing (6) consisting of 12 rollers and a
bearing may fall in the transmission case; avoid drop­
ping and damaging the bearing. Remove pilot bearing
(6) from gear pocket or from pilot end of mainshaft
(
2 2
).
9. Remove speedometer drive gear (27) and spacer (26)
(if used).
10. Push mainshaft assembly (22) toward rear of trans­
mission case far enough so mainshaft rear bearing
(23) clears transmission case.
11. Using a suitable puller, remove mainshaft rear bear­
ing (23) from end of mainshaft (22) (fig. 3P).
12. Tilt front end of mainshaft to clear front end of
transmission case, then remove the mainshaft assem­
bly (22).
REVERSE IDLER GEAR REMOVAL
1. Remove reverse idler lock screw and lock washer,
then remove reverse idler shaft lock.
2. Using a suitable puller in slot in end of reverse idler
shaft (38), pull shaft out of transmission case and rev­
erse idler gear (35) (fig. 4P).
3. Remove reverse idler gear (35), bearings (36), and
CHEVROLET SERIES 70-80 HEAVY DUTY TRUCK SH O P M A N U A L