reason you had problems was the same reason I did. The valve bodies were nothing more than a regular C4 valvebody that had been modified....slightly....drive was still drive 2nd was 2nd (took off in 2nd just like any other stock VB) and low was low. Stayed in low as long as you left the lever in the position, same for 2nd. The one I had was just a valvebody with a shift kit (bought it as a manual valve body)...but it would shift 1-2-3 in the drive position (shifted HARD, but shift it did). That one was from a reputable trans shop out on the west coast, IIRC. Still have it somewhere. I can build them at home now, no need to spend $100+ on one. Same for a powerglide.