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that switch is also called a fan cutoff switch,that's all I have ever known it to be called and it's in the TM as such. it looks like in a TH400 application they call it kick down switch, in a 4L80E application it's called a fan cutoff switch.

Injector pump has cold start advance and fuel solenoid. The fan cutoff switch is attached on a bracket and comes in contact when it's WOT to cut the fan off when passing. There is no kick down solenoid on the pump...

Here is what I know..I'm no trans guy. You can disconnect the cable on the modulator at the pump, when you driving, pull the cable, the trans will drop down a gear, my schematic is for a 4L80E.

TH400 is mechanical, it does not use a kick down switch...the switch tells the fan to disengage if it's on for passing or more power. The trans kicks down via the mechanical modulator.