Chevrolet 70 1969 Series, Shop Manual

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TRANSMISSION AND CLUTCH 7-44
5-SPEED TRANSM ISSIONS
(CLARK MODEL 3 8 5 V , 387V )
The Clark Model 385V, 387V transmission is used as
standard and optional equipment on 70-80 truck series.
Figure 1 shows the shift pattern of the transmissions
and Figure 2 is a cross section showing the relative loca­
tion of parts.
TRANSMISSION OVERHAUL
GENERAL
IMPORTANT: Cleanliness is extremely important
and an absolute must when repairing or ov­
erhauling 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 2 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 convention­
al gearshift lever, accomplish the following pro­
cedures:
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) straight off shift bar hous­
ing (
14).
Remove and discard lower to housins uasket.
SHIFT BAR HOUSING REMOVAL
I. 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. 3). Discard gasket.
4. Shifting by hand, engage transmission into two speeds
at the same time to lock up the transmission.
6
L A T E T Y P E
O
E A R L Y T Y P E
F ig u re 1 — T r a n sm is sio n S h ift P a tte rn s (C la r k M o d e l 3 8 5 V , 3 8 7 V )
CHEVROLET SERIES 70-80 H EAVY DUTY TRUCK SH O P M A N U A L