Chevrolet 10 Series 1967, Service Manual

Page: 416 / 605

CLUTCHES AND TRANSMISSIONS 7-30
FIVE-SPEED TRANSMISSION (NEW PROCESS)
INDEX
Page
General Description......................................................... 7-30
Maintenance and Adjustments ....................................... 7-30
Transmission Gearshift Lever ................................. 7-30
Transmission C o v e r ................................................... 7-30
Page
Rear Bearing Retainer Oil Seal and/or
Speedometer G e a r s ................................................... 7-31
Service Operations............................................................ 7-32
Removal from V e h i c l e ................................................ 7-32
Installation to V e h i c l e ................................................ 7-32
GENERAL DESCRIPTION
The 5 -speed transmission (New Process) is a selective
synchromesh type with five speeds forward and one re­
verse housed in a cast iron case. A 9-1 /2 " x 2-1/2"
band type parking brake is mounted on the rear of the
transmission, and standard S.A.E. six bolt power take-off
openings are provided on both sides of the case. All
gears are helical with the exception of the first and re­
verse gear and synchromesh action is provided in second,
third, fourth and fifth gears. The mainshaft, counter­
shaft, reverse idler shaft and all gears are machined
from alloy steel and carburized for durability. In addi­
tion, all gear teeth are shot peened for high fatigue
resistance.
The main drive or clutch gear is supported by a single
row ball bearing mounted in the front of the transmission
case. The mainshaft is supported at the front by roller
bearings located in the hollow end of the clutch gear and
is supported at the rear by a single row ball bearing lo­
cated in the rear of the transmission case. The counter­
shaft is supported in a single row ball bearing at the front
which takes the thrust load and by a roller bearing at the
rear. The reverse idler cluster gear rotates on two
steel backed bronze bushings which are a press fit in
each end of the gear.
Pin type synchronizer assemblies are used. The syn­
chronizer assembly used for 2nd and 3rd speeds consists
of two inner synchronizer rings, or cones, and one outer
synchronizing ring, or plate. The synchronizer for 4th
and 5th speeds consists of two inner rings, or cones, and
two outer rings, or plates.
Shifting is accomplished by a floor mounted gearshift
lever attached directly to the transmission cover. Fig­
ure 64 shows layout of transmission parts.
MAINTENANCE AND ADJUSTMENTS
TRANSMISSION GEARSHIFT LEVER
Removal
1. Slide the open side of Tool J-8109 over the lever, en­
gage the lugs of the tool in the open slot of the re­
tainer cap, press down on the tool and turn it to the
left to disengage the lugs on the retainer cap.
2. Lift the lever out of the cover.
Installation
1. Place the gearshift lever in position in transmission
cover.
2. Slide the open end of Tool J-8109 over the lever,
engage the lugs of the tool in the open slot of the re­
tainer cap, press down on the tool and turn to the
right to engage the lugs on the retainer cap.
TRANSMISSION COVER
Removal
1. Remove accelerator pedal, floor mat and transmis­
sion cover from body floor on conventional models.
On Forward Control models, remove the front floor
pan.
2. Shift transmission into 2nd or 3rd gear, then remove
gearshift lever from transmission cover, using Tool
J-8109.
3. Remove cap screws attaching transmission cover to
transmission case and remove cover.
CAUTION:
Place a piece of cardboard over
transmission cover opening, using two of the
cover attaching screws to hold it in place. This
will keep anything from falling into the trans-
mission.
Disassembly
1. Using a square edged "Easy-out," remove the pin
retaining the
1
st shifter fork and shifter head to
shifter shaft (fig. 1NP).
2. Turn shifter shaft one-half turn to push lock ball out
4TH AND 5TH
SHIFTER FORK
2ND AND 3RD
SHIFTER FORK
Fig . 1 N P - Removing Retaining Pins
CHEVROLET TRUCK SERVICE MANUAL