Ron, when I was racing my 95 Dak sport I hardly ever looked at the tach. Not even sure what I was shifting at, probably 5200-5400 the truck went consistant 14.20's, If I wanted more I'd have to come out a little harder and hold the 2-3 shift a little longer but I was always worried about the rear (broke 2 under warrenty) so that stopped at 68,000 miles.