Section 7 - Transmission

Section 7
The Syncro-Mesh Transmissions used on the passenger car, commercial 1/2-ton, 3/4-ton and 3/4-ton special trucks are essentially the same with the exception that on the passenger car the shifting mechanism is mounted on the side of the trans­mission while on the 1/2-ton and 3/4-ton trucks the cover and shifting mechanism is mounted on top of the transmission. Carburized gears, and roller bearing type countergear, are used in the 1/2, 3/4, and 3/4-ton special truck 3-specd transmissions. All gears and splines are helical cut as shown in Fig. 1, and all surfaces of the passenger car transmis­sion shifter yokes contain a "wear resisting coating" to prevent scoring of any surface during the break-in period and to provide greater resistance to wear.
NOTE—When installing a four-speed transmis­sion in a half-ton truck, it is necessary to re­place the brake main cylinder bracket with one designed for use with the four-speed trans­mission.
In addition to the above, it will also be neces­sary to install a speedometer gear adapter, and a different set of speedometer gears on 1/2, 3/4 and 3/4-ton special trucks. For the correct set of speedometer gears to use, refer to the speedometer gear and adapter specifications given in the Rear Axle Section of this Shop Manual.
Gear Ratios:
First gear .......,........... 2.94 to 1
Second gear................ 1.68 to 1
Third gear ................. 1 to 1
Reverse gear ............... 2.94 to 1
Grease capacity...................1-1/2 pints
The same special tools used for overhauling the 1937 through 1941 transmissions can be used on the 1942 passenger, commercial and truck trans­missions.
1. Remove the floor mat and the cover over the transmission from the body floor.
2.   Working from underneath the car, remove the two bolts which fasten the two halves of the reactionary lever metal boot together, then remove the outer half of the boot.
3.   Loosen the three capscrews fastening the vacuum cylinder bracket to the side of the transmission. Loosen the clamp bolt holding the reactionary lever assembly to the trans­mission operating shaft, and carefully drive the assembly from the end of the shaft.
4.   Remove the cotter pin from the transmission end of the selector rod. and disconnect the rod from the selector lever.
5.   Remove the three capscrews fastening the vacuum cylinder bracket to the side of the transmission and move the whole assembly (bracket, vacuum cylinder and reactionary levers) away from the transmission.
6.   Disconnect the pull rod and brake cables from the emergency brake idler lever, and re­move the idler lever. Disconnect the speedom­eter cable from the transmission case.
7.   Remove the capscrews holding the universal joint ball collar to the retainer, and slip the ball and collar back on the propeller shaft
8.   Remove the four capscrews which fasten the universal joint front trunnion needle bearings to the front yoke. Remove the two front yoke trunnion bearings and split the joint.
9.   Push the front end of the propeller shaft down to gain clearance for removing the transmis­sion.
10.    Remove the four bolts holding the rear trans­mission mounting to the frame cross member.
11.    Remove the two top transmission to clutch housing capscrews, and insert two transmis­sion guide pins in these holes.
12.   Remove the flywheel underpan and remove the two lower transmission to clutch housing capscrews.
13.   Slide the transmission straight back on the guide pins until the clutch gear shaft is free of the splines in the clutch disc. The use of





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