The last 3 times I have been to WOT (do not do it that much) I noticed that my shift point in first gear is NOT 6000 rpms but rather 5700-5800. When I first had my Wait4Me tune installed it was reving to 6000 rpm like clockwork. I know there is some error in the stock tach but what is going wrong here? Do I need to check something?

 

The PCM takes a number of things into consideration before making a shift. Mostly Throttle Position; RPM; and Speed, whichever comes first. There's a few pressure checks inside the trans it has to make before the shift event occurs, too. The trucks usually seem to et better with the shift points at 5700-5900 rpm. In my experience.