Even on WOT it will still shift early. I've had the truck for 9 years. It sat for a few years and now it's my everyday driver again. Even if I am rolling at say 20mph and floor it, it will not downshift. Also, if I am to upshift manually, first will stay until I shift into second but if I go from 2nd to drive it will jump back to first then to drive. I am completely lost.