Table of Contents
Advertisement
Overdrive provides a driving ratio of engine speed
to rear wheel speed that is numerically lower than
direct drive. In overdrive the engine revolves 30%
slower than in direct gear at the same car speed,
resulting in less wear on engine parts as well as
greater fuel and oil economy and smoother operation
at high speeds.
SERVICING UNITS REQUIRING
REMOVAL OF OVERDRIVE
HOUSING ONLY
Repairs to the overdrive case, overdrive mainshaft,
mainshaft ring gear, free wheeling cam, pinion cage
assembly, stationary gear, shift rail and fork assem-
bly, overdrive mainshaft rear bearing, overdrive
mainshaft oil seal, speedometer drive gear, solenoid
pawl and interlock plunger may be performed under-
neath the car by removing the overdrive housing
without disturbing the transmission. See "Overdrive
Housing Removal". However, if the transmission
mainshaft, overdrive adapter, or transmission main-
shaft bearing are to be replaced, it will be necessary to
proceed as outlined under "Transmission and Over-
drive Removal".
OVERDRIVE HOUSING REMOVAL
1. Place car on stand jacks.
2. Remove drain plugs and drain transmission and
overdrive cases.
3. Disconnect governor switch wire at control switch,
also two wires at solenoid.
4. Remove nuts and washers from "U" clamps attach-
ing propeller shaft universal cross to rear axle pin-
ion companion flange.
5. Lower rear end of propeller shaft and pull complete
assembly backward out of transmission.
NOTE: Use masking tape to hold bearings to
universal joint.
6. Remove speedometer cable and speedometer
driven gear.
7. Disconnect overdrive control cable at control shaft
lever.
8. Drive out the overdrive control shaft tapered pin,
SECTION 9
OVERDRIVE
Figure 1, and pull control shaft out as far as possible
to disengage the operating cam of the shift shaft
from the slot in shift rail.
NOTE: Small end of taper pin is down.
9. Remove the three bolts and lock washers and re-
move the mainshaft rear bearing retainer.
10. Remove the four bolts attaching the overdrive
housing to transmission and overdrive adapter.
11. Remove the overdrive mainshaft rear bearing snap
ring (105) and spacer washers 104, Figure 2.
12. Remove overdrive housing. (Lightly tap the end of
the overdrive mainshaft with a rawhide mallet to
prevent mainshaft from coming off with the over-
drive housing and spilling the free wheeling rollers.)
NOTE: Removal of the overdrive housing will ex-
pose the governor gear, speedometer gear, over-
drive mainshaft and ring gear free wheeling cam,
pinion and cage assembly, shift rail and fork, sta-
tionary gear, stationary gear cover plate and over-
drive mainshaft bearing.
FROM REAR OF ADAPTER
1. Install one bolt removed from housing to hold the
adapter plate to the transmission case.
OVERDRIVE 92
FIGURE 1
REMOVAL OF PARTS
Advertisement
Table of Contents
