External Controls

DESCRIPTION
The external control connections to the transmission are:
1. Manual linkage to select the desired operating range.
2. Engine vacuum to operate the vacuum modulator unit.
3. An electrical signal to operate an electric detent solenoid.
4. A stator solenoid to "switch the pitch" or stator angle. This device is used only with transmissions having a variable pitch stator.


VACUUM MODULATOR
A vacuum modulator is used to sense engine torque input to the transmission automatically. The vacuum modulator transmits this signal to the pressure regulator, which controls line pressure, so that all torque requirements of the transmission are met and proper shift spacing is obtained at all throttle openings.

DETENT SOLENOID
The detent solenoid is activated by an electric switch at the carburetor. When the throttle is opened sufficiently to close this switch, the solenoid in the transmission is activated, causing a downshift at speeds below 70 mph. At lower speeds, downshifts will occur at lesser throttle openings without the use of the electric switch.


PRESSURE SWITCH (TCS SYSTEM ONLY)
A pressure sensitive switch is screwed through the rear face of the valve body assembly into the direct clutch oil passage. This switch is closed (grounded) in all but direct drive and reverse, since there is no oil pressure in this passage in Neutral, First or Second gear. The pressure switch is connected by a wire to a transmission connector and hence through an engine solenoid valve to the distributor and engine thermoswitch. When this circuit is grounded (switch closed), spark advance is retarded.

When the transmission shifts to high gear (or reverse), oil pressure in the direct clutch passage will open the switch and circuit so that the transmission will no longer affect the vacuum advance of the distributor.