Have had many 55 chevy currently picked up a nice 55 bel air that has a 383 stroker motor run great problem I'm having is with the 700R4 never had one in any of my 55, in the past always ran a 350 turbo built could always take off with shifter in low gear and hold the gear until I wanted it to shift it into 2nd.The problem with this 700R4 it will not hold low gear or 2nd shifts out on its own at low rpms no matter how I adjust the tv cable is this normal for these transmission can't even get motor to it power curve? Not a trans guy is there a kit to cure this? running a ford 411 gear Thanks in advance 