Yeah everyone seems to think it is the stall. It idles fine but under a load it just chokes. If I give it a little gas before the shift it is ok, or if I shift fast it is ok. A slow shift kills it everytime. Lane said the stall needs to be loosened up some and recommended something around 2500. Mine is stock TH400 and old as who knows what. I was very impressed with the tune and response of the motor. I ran it today and it freaking moves in high range