Chevrolet 30 Series 1967 Service Manual page 422

CLUTCHES AND TRANSMISSIONS 7-36
The four-speed auxiliary transmission is used as op­
tional equipment for model M600 tandem axle trucks. The
transmission is manually shifted and has four speeds for­
ward: 1st, 2nd, direct, and overdrive. A six bolt power
GEARSHIFT LEVER ASSEMBLY
Removal and Installation
l e Disconnect the two shift rods at the gearshift lever
by removing the cotter pin and clevis pin.
.
2 Remove four nuts and lockwashers to remove gear­
shift from cab, then remove two gaskets and stop
plate.
3. Install in reverse order.
Fig. I Q - Transmission Control Lever
Overhaul
1. Apply downward pressure to cap, then rotate slightly
to free it from pins in tower.
2. Remove knob and nut; then remove cap, spring cup,
and spring.
3. Assemble in reverse order.
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 speedometer cable at rear of trans­
mission.
5. Using a suitable jack and some means to secure the
take-off is provided on the right and left hand side of the
transmission and a disc-type parking brake is mounted at
the rear of the transmission.
SHIFT ROD ADJUSTMENT
With the shift control rods disconnected at the gear­
shift, place the gearshift lever in neutral and place the
two transmission shift rods in the neutral (center detent)
position. Adjust the length of the shift control rods by
loosening the jam nuts, then turning the clevises to
lengthen or shorten the rods as required so the holes
align with those in the gearshift lever shafts. Install
clevis pin and secure with cotter pin. Tighten jam nuts
against clevises.
LUBRICATION
The auxiliary transmission should be lubricated as
prescribed in Section 0 of this manual.
SERVICE OPERATIONS
transmission, remove the two nuts and lockwashers
securing the U-bolt at the front to the second cross­
member and disconnect the left and right bolts, nuts,
and remove spacers from the crossmember support
at rear of transmission.
. Lower transmission and remove from vehicle.
6
TRANSMISSION INSTALLATION
1. Place transmission on suitable lift and raise into
position.
Fig. 2 Q - Transmission Control Rods
CHEVROLET TRUCK SERVICE MANUAL