Kickdown switch not working

[johndeeregreg4]

I just installed a kickdown switch in my k10 with a th400. The pedal when fully depressed pushes on the switch but not to the point where it’s maxed out. Could this be the cause or is my solenoid in the tranny just shot?


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[bd]

Check for power on the orange wire at the left side of the transmission case using a test light or voltmeter while an assistant depresses the accelerator pedal with the ignition on, engine off.  No power: the switch contacts aren't closing.  Power: the solenoid or its wire inside the trans may be the culprit.

[78 Chevyrado]

I had to do this on mine to make it act right.  I dunno why it wouldn't adjust correctly, but it wouldn't.  so I added layers of split tubing to the sensor knob, until it bottomed out when flooring the pedal. 

This is 3 or 4 layers of slpit hose used as a spacer.  Back then mine wouldn't downshift at all.  After I added the split hose, it down shifts correctly ever since.

[78 Chevyrado]

IIRC  you pull the senros up to the end and then depress the pedal to the floor and that will set it.  well it has to run that sensor all the way to the other end.  Just keep adding layers of hose until when you floor it it JUST hits the end of sensor travel.

[78 Chevyrado]

When I found and fixed this problem, it was after Grandad told me it would never downshift like he wanted while towing.  he said he always had to downshift the truck manually to make it go even when it was new.