Phil,
Re: the last posting...I have a B&M shift kit in my TH350 and it still hesitates. Correct me if i'm wrong, but you're saying that when you shift.....there is a slight hesitation from when you actually shift until your trans switches gears. Correct? I've been told that this does have to do w/ the vacuum...and that Summit offers a adjustable modulator (i'm going to check it out). However, that's just info i've received from others and could be incorrect. Good luck to ya!