Chevrolet 30 Series 1967 Service Manual page 409

transmission should be fully assembled except for the
power take-off cover. Then proceed as follows:
1. Loosen the eccentric nut and rotate the eccentric,
using a screwdriver in the slot in outer end of ec­
centric, until slot with dot on end is to the rear. This
places the reverse idler in its extreme rear position
and will provide for maximum engagement when the
transmission is shifted into reverse.
2. Shift the transmission into second gear.
3. Check for interference between the reverse idler
gear and the first and reverse gear. If interference
exists, rotate the eccentric in a counterclockwise
REMOVAL FROM VEHICLE
1. Drain lubricant from transmission.
2. On all except 1/2 ton models, disconnect parking
brake and remove lever as outlined in Section 5.
3. Remove the propeller shaft as outlined in Section 4.
4. Remove transmission gearshift lever as outlined un­
der "Maintenance and Adjustments."
5. Remove screws which fasten steering jacket grom­
met to floor and slide grommet up jacket out of the
way.
. Remove accelerator pedal and floor mat.
6
7. Remove the sheet metal screws attaching transm is­
sion cover to body floor and remove cover. On
Forward Control models, remove both front and rear
floor pans.
. Disconnect the speedometer cable from the driven
8
gear fitting at the
retainer.
9. Remove the two top cap screws attaching the trans­
mission to clutch housing and insert the two Guide
Pins, Tool J-1126, in these holes.
10. Remove the flywheel underpan and remove the two
lower transmission to clutch housing capscrews.
11. Slide the transmission straight back on the guide pins
until the clutch gear is free of the splines in the
clutch disc. The guide pins in the top holes support
the transmission during this operation and prevent
damage to the clutch disc.
12. Remove transmission from vehicle.
HEAVY-DUTY 4-SPEED TRANSMISSION
General Description......................................................... .... 7-24
Maintenance and Adjustments
Rear Oil Seal Replacement
Remote Control A s s e m b ly .......................................... .... 7-24
R em oval.................................................................. .... 7-24
In s ta lla tio n ............................................................ .... 7-24
A d ju s tm e n t............................................................ .... 7-24
Service O p e ra t io n s ......................................................... .... 7-25
Transmission R ep lacem en t....................................... .... 7-25
R em oval.................................................................. .... 7-25
SERVICE OPERATIONS
transmission rear bearing
(NEW PROCESS MODEL 4 3 5 )
Page
....................................... .... 7-24
............................................ 7-24
direction enough to obtain approximately 1/32" run­
ning clearance.
through the power take-off opening.
4. Shift the transmission into reverse and check for
clearance between reverse idler gear and transm is­
sion case at the rear. If necessary, rotate the ec­
centric an additional amount in a counterclockwise
direction to obtain running clearance at this point.
5. Tighten the eccentric nut to 40 ft. lbs. and to next
lock index. Install lock spring.
. Reinstall the power take-off cover and tighten cover
6
bolts to 20-25 ft. lbs.
INSTALLATION IN VEHICLE
1. Install transmission through opening in floor.
2. Place the transmission on guide pins and start main-
shaft in clutch disc and slide forward.
3. Install the lower transmission mounting bolts, re­
move the upper guide pins and install the top mount­
ing bolts.
4. Install the flywheel underpan.
5. Install the propeller shaft as outlined in Section 4.
. On all except 1/2 ton models, install and adjust the
6
parking brake as outlined in Section 5.
7. Install transmission gearshift lever and adjust re­
verse idler gear eccentric as outlined under "Main­
tenance and Adjustments."
. Connect speedometer cable to the driven gear fitting
8
in the transmission rear bearing retainer.
9. Fill the transmission with 5-1/2 pts. of S.A.E. 90
gear lubricant and tighten drain and filler plugs to
30-35 ft. lbs.
10. Install the transmission floor cover to body floor.
On Forward Control models, install front and rear
floor pans.
11. Install the floor mat and connect the foot accelerator
pedal.
12. Slide the mast jacket grommet in position and install
the retainer screws.
13. Road test the vehicle for operation of transmission
in all speeds.
IN D EX
Installation ............................................................ ....7-25
Transmission C o v e r ................................................... ....7-27
D isa ssem bly ............................................................ ....7-27
A s s e m b l y ............................................................... ....7-27
Remote Control A s s e m b ly .......................................... ....7-28
D isassem b ly ............................................................ ....7-28
Shift Rail Yoke Bushing Replacem ent..................... ....7-28
Shift Rail Cover Oil Seal R ep lacem en t.................. ....7-28
Assem bly.................................................................. ....7-29
CLUTCHES AND TRANSMISSIONS 7-23
This clearance can be observed
CHEVROLET TRUCK SERVICE M ANUAL
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