Sounds like the shifter is not properly adjusted. These 700R4's are very, very precise in the travel adjustment. I had to re-adjust mine about 3 times before I got it right. I got my shift kit from Lo-Kar and they include a device to help with the adjustment. Make sure you have your brake on when you start the truck. The truck can start while in gear if the adjustment gets to far off. Get the shifter re-adjusted and you should be fine. Cecil.......