TH400 downshift problems
Hey everyone it's been a while since I've posted meaning I've actually been out driving my car and not wrestling with it but one issue is finally getting to me. My th400 refuses to down shift when coming to a stop until I sit there for a full 3 seconds. And if I manually shift it down to first when I come to a stop it slams and lurches me forward an inch. It's rebuilt, has a 2200 stall converter and new vacuum solenoid and fill vacuum from the manifold. The only thing I didn't get hooked up was the electric throttle downshift that you put on the carb to the trans. I thought that only had to deal with full throttle down shifts so I didn't think it mattered but maybe it's part of it? Any help is appreciated!