Guys,
I think ( I don't do much of it) we're making this much harder than it really is.
I spent a total of about $10.00 and 1 hour of time on a small micro switch and relay for my TH400 kickdown. All that is needed is 12v to detent valve on the side of the tranny. Used the switch to trigger the relay.
My buddy made a small bracket that we screwed to the carb and is adjustable for when you want the kickdown to occur.
The link in my first post includes a pic of my carb with the switch attached to the carb.
Hope that helps a little.
--joe
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