I'm not sure what's up with my half ton, one of my friends said I need a shift kit. I'm not exactly sure, when I'm accelerating up to 80k my rpms are at 1500 rpm but jump up to 2000 rpm rapidly, but once I hit 90 it stops. Now if I punch it from a dead stop it won't do it. It's annoying as hell to drive with, just looking to get a second opponion. Worst case I do have another trans lined up for $100.