Check your kick down linkage. There is a small hole in throttle bracket and pivot. Insert a drill bit through those holes. Un snap the lower rod. adjust the lower rod so in it's natural state it will snap back on. Then remove the drill bit. Hold throttle wide open. Adjust upper rod so that at WOT there is only a bit of free play on trans lever. You don't want the lever pressed back hard. It needs a little free play. Many people forget to adjust the lower rod correctly to get the proper ratio.