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Dj, I forgot about that regulator valve......its the one that the lines from the Vac pump and the Tranny Modulator connect to on the IP right?

Ok, nevermind then, if it works as a kickdown should, then your problem is elsewhere. You may be looking at a trip to a tranny shop......

Did you check the electric downshift circuit?, try unhooking the wire that goes to the tranny. see if the shift points change. Modifying the shift points in a TH400 (I think) will require work on the valve body in the tranny....

TH 400, no overdrive. Check your Vac lines between the Vac pump and the IP. Also check the electric kickdown switch thats mounted on the accelerator pedal bracket, make sure it opens and closes (continuity) with a meter, or measure voltage coming out of it make sure it goes from 0 to 12v Easier...