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For TH400's the solenoid replaced the mechanical rod linkage on other units. And, I suspect that there wasn't room for the rods in the original cars that were fitted with a TH400. They were moving to bigger power and just plain bigger in the land yachts at the time (1964 Cadillac and Buick)...

The kickdown switch is activated on the pump. The solenoid is in the valve body of the transmission. THM400's have been equipped with the solenoid from the very beginning in 1964.

As far as I can find, it's a stock GM6 (6 bolt) heavy duty converter with a 1350 stall and no lock up.

Sorry, my bad, the second tab is for variable pitch converters. Too many variations on these things. My mind got crossed with electrically controlled lockup converters.

The THM400 and 3L80 have a kickdown solenoid in the valve body. The harness wire comes from the kickdown switch on the injection pump (circuit 315) and provides power to solenoid around 3/4 throttle. This should not be confused with the fan control also on the pump. THM400's may have a...