96 chev truck 5.7 Vortech..with Vortec supercharger, headers, etc...runs great. thanks for the help to Bill at HPtuners for getting me on the right track with the real time tuning....anyway, everything is great but when truck is put into 4WD low range, it doesnt shift through the gears, just 1st gear...I assume the pcm has no clue it is in 4wd low and still looks for the part throttle shift MPH which it never gets to.......anyone run into this and have a cure??????