Well the last few days i have noticed a bad vibration when accelerating from approx. 50-60mph up. When i roll into the throttle at these speeds the whole truck vibrates hard and stops when i let off. It doesnt do it at any lower speed. I have also noticed it has a hard time finding a gear when i ease off a stop and then decide to give more throttle then it bounces between gears a second before it decides which it wants. If, say i roll off a stop and let it secure a secong gear shift and then roll it on it seems fine. If i floor it from a stop and run up to say 70 or 80 before shutting down it shifts like a dream. The truck overall pulls hard like it should but its just these couple of areas it seems to kinda slip.

Anyone..........