Chevrolet 10 Series 1968, Service Manual

Page: 492 / 713

CLUTCHES AND TRANSMISSIONS 7-29
SERVICE OPERATIONS
TRANSMISSION REMOVAL
1. Disconnect prop shafts at the input and output ends of
transmission.
2. Disconnect gearshift lever rods at their connection to
the shift rods at the transmission.
3. Disconnect any connections to the power take-offs on
the left and right sides of the transmission.
4. Disconnect s p e e d o m e t e r cable at r e a r of
transmission.
5. Using a suitable jack and some means to secure the
transmission, remove the two nuts and lock washers
securing the “ U” bolt at the front to the second
crossmember and disconnect the left and right bolts,
nuts, and remove spacers from the crossmember
support at rear of transmission.
6
. Lower transmission and remove from vehicle.
T R A N S M IS S IO N IN S T A L L A T IO N
1. Place transmission on suitable lift and raise into
position.
2. Place
“ V ”
bolt under nose of the transmission hous­
ing and secure front of transmission with two bolts
and lock washers to crossmember.
3. Place a spacer between the rear left transmission
mounting flange and crossmember support. Secure
transmission to crossmember support by installing
bolt, nut, and lock washer. Similarly secure right
side.
4. Connect speedometer cable to adapter at rear of
auxiliary transmission.
5. Install any connections to the left or right power
take-offs.
6
. Connect control rods to transmission shift rods
(refer to Shift Rod Adjustment).
F ig . 2 0 C —Transmission Mounting
7. Connect input and output prop shafts.
Shift Cover and Forks
Refer to Figure 21C
Disassem bly
1. Mount cover in vise and remove lock wires (3) and
shift fork clamp screws (4).
2. Remove poppet screw from each side of cover and
jar springs, balls, and retainer out through poppet
holes.
3. Remove shift rods (1 and 6 ) from cover, stripping off
forks (5 and 7) as shift rods are removed. Tip cover
on one side and jar interlock out of shift rod boss.
4. Remove shift rod oil seals, if new seals are
required.
5. Remove transmission breather assembly from cover.
Assem bly
1. Mount cover (2) in vise. Coat oil seal recesses with
sealing cement, and press new shift rod oil seals into
recess.
2. Insert 1st and 2nd shift rod ( 6 ) (longest rod) in bot­
tom hole of cover ( 2 ) being careful not to damage oil
seal.
3. Move shift rod through support and install 1st and
2nd shift fork (5) on rod with offset toward front as
rod is moved into position.
4. Install clamp screw (4), move rod to neutral position,
and tighten clamp screw. Install lockwire (3) r e ­
taining clamp screw.
5. Insert interlock in rod support, then insert direct and
overdrive shift rod ( 1 ) (short rod) in top of cover.
6
. Install direct and overdrive shift fork (7) on rod with
offset toward front and move rod through rod support
boss.
Fig . 2 1 C —Cover and Shifting Mechanism
1. Direct and O verdrive Shift Rod 5. 1st and 2nd Shift Fork
2. Shifter Housing (Cover) 6. 1st and 2nd Shift Rod
3. Lock W ire
7. Direct and O verdrive
4. Shift Fork Screw Shift Fork
CHEVROLET TRUCK SERVICE MANUAL