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Re: Gm Th400
TH400 has an electric kickdown which is a 1/4" spade lug on the drivers side. 12 v input will down shift depending on rpm range. The Vacuum modulator is located on the passengers side and is connected to full manifold vac. It controls shift points during normal acceleration. The govenor (internal) controls WOT upshifts. The TH400 is the strongest auto 3 speed GM made and can be easily modified to handle 800+ HP with a little $$.
Last edited by old goat; 01-12-2005 at 09:11 PM.
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