hey guys,,i need some input on a C6 auto. It is a 74 model,,clean as a pin,,looks to be recently rebuilt too.I have it behind a 71 460.It shifts into drive and reverse like new,,and shifts great,,,problem is,,,,it shifts to darn quick. I mean as soon as the truck gets rolling,it goes into second,,way too soon. Shifts into third way too soon also. I tried adjusting the modulator screw to prolong the 2-3 shift times,,but cant get it much better.Holding 22 inches of vacuum at idle.Do i need to put a shift kit in it to reprogram the shift points?? Or do you all think a new modulator will fix the shifting problems?? Most C6's i have had wind up a little before switching gears,,,and will drop from third to second on a forced vacuum downshift,,but this one doesn't. Thanks for any advice you can give me on this one. Jeff K.