Chevrolet 10 Series 1968, Service Manual

Page: 476 / 713

CLUTCHES AND TRANSMISSIONS 7-13
Installation
1. Apply a light coating of High Temperature Grease to
the main drive gear bearing retainer and splined
portion of transmission main drive gear shaft to
assure free movement of clutch and transmission
components during assembly.
CA U TIO N : Do_ not apply an excessive amount
of grease in the above areas, as under normal
operation this grease would be thrown onto
clutch facings resulting in clutch failure.
2. Shift the transmission into high gear.
3. Mount transmission on dolly or jack and move into
position under the vehicle.
4. Align the transmission main drive gear shaft with the
clutch disc hub by rotating the transmission com­
panion flange or output yoke. Move the transmission
forward, guiding the main drive gear shaft into the
clutch disc splines.
IM PORTANT:
Avoid springing the clutch when
the transmission is being installed to the engine.
Do not force the transmission into the clutch
disc hub. Do not let the transmission hang un­
supported in the splined portion of the clutch
disc.
5. Install flywheel housing-to-transmission mounting
bolts and washers. Tighten bolts to 40-50 ft. lbs.
torque.
IM PORTANT: Perform th e following on all
“ G” models:
a. Carefully raise the engine and transmission as­
sembly to normally installed position.
b. Install engine rear mount attaching parts. Tighten
engine rear mount-to-bracket attaching nut to
55-75 ft. lbs. torque.
c. Remove cardboard from between radiator and fan
blade.
d. Remove adjustable jack stand from under the
engine.
5. If vehicle is equipped with power take-off, reinstall
unit and controls on transmission.
6
. Connect propeller shaft to transmission as de­
scribed in “ PROPELLER SHAFTS” (Section 4) of
this manual. Remove transmission jack.
7. Connect parking brake lever and controls (if used).
Adjust brakes as outlined in “ PARKING BRAKE”
(Section 5) of this manual.
8 . Install flywheel housing underpan. Tighten cap
screws firmly.
9. Reconnect speedometer cable to adapter at trans­
mission and connect back-up lamp switch wire.
10. Reinstall shift controls on transmission.
NOTE:
On vehicle equipped with 3-speed trans­
mission, reconnect shift levers to transmission
side cover.
firm ly and rotate clockwise to install gearshift
lever. Install transmission floor pan cover and
floor mat.
11. If other equipment (exhaust pipe, support brackets,
etc.) was removed, reinstall these parts.
12. Refill transmission with lubricant recommended in
LUBRICATION (Section 0) of this manual.
13. If necessary, adjust clutch or transmission control
linkage to achieve proper transmission operation.
REAR OIL SEAL REPLACEMENT
1. Drain lubricant from transmission.
2. Disconnect propeller shaft from transmission as
described in “ PROPELLER SHAFTS” (Section 4) of
this manual.
3. On 3-speed and Warner 4-speed transmissions, per­
form the following replacement procedures:
a. Remove slip joint yoke from rear of transmis­
sion mainshaft.
b. Pry seal out of extension housing or remove oil
seal using oil seal remover (J-5859) and slide
hammer (J-2619) as shown in Figure 2C.
c. Coat outer diameter of new oil seal with sealing
cement. Install new oil seal using extension hous­
ing oil seal installer (J-5154).
d. Install slip joint yoke on rear of transmission
mainshaft.
4. On Muncie and New Process 4-speed transmissions,
perform the following:
a. Remove parking brake from rear of transmission
as described in “ PARKING BRAKE” (Section 5),
when used.
b. Disconnect speedometer cable and remove speed­
ometer driven gear from mainshaft rear bearing
cap.
c. Using flange or yoke holding tool, remove the out­
put yoke or companion flange nut. Pull output
yoke or companion flange nut off the mainshaft.
d. Remove mainshaft rear bearing cap and gasket.
Discard gasket.
e. Remove oil seal from rear bearing cap. Discard
oil seal.
f . Coat outer diameter of new oil seal with sealing
cement. Install oil seal in rear bearing cap using
a suitable installer. Drive seal flush with outside
of rear bearing cap, being careful not to damage
seal as shown in Figure 3C.
On vehicle equipped with 4-speed transmission
(except Muncie) perform the following: Shift the
transmission into neutral, install transmission
cover and gearshift lever, transmission floor
F ig . 2 C -R e m o v in g M ainshaft Rear O il S e a l-3 -S p e e d
pan cover and floor mat.
On vehicle equipped with Muncie 4-Speed
transmission, install gearshift lever using Tool
J-8109 as shown in Figure 1C. Press down
CHEVROLET TRUCK SERVICE MANUAL