I recently put a 2,500 hughes converter in my 2000 silverado 4l60e 5.3. The first time i take off it will go through all the gears perfectly. When i come to a stop it will try to take off in 3rd. I can manually putt it in 2nd and take off. If i try and putt it in 1st it will not go it will stay in second. any ideas?