RE: need acceleration!
if the tires are spinning a lot you can do a couple of things do combat this
1. put in a lighter weight shock oil this will allow the rear to squat a little faster there for transfering weight faster.
2. put on a little bit softer tires on the rear.
3. Or be smooth with the throttle in and out of the corner and not put so much throttle into in coming out.
Remember that if the truck cant hook up (spinning the tires) the acceleration will be very slow. You can have the best most powerful engine in the world but if you cant put that power to the ground then it's not worth having the engine.
But if try the gear changes and if the tires spin even more and the acceleration doesnt improve try some of these little tricks