i have a stampede with a Velineon 3500 brushless kit. i want the truck to have moretop end less accel. how i would i achieve this.

Think of it like the gears on a bike. The pedals are the motor, and the back wheel is your spur gear. Bigger gear at the pedals, and smaller gear at the back wheel = SPEED!!

translated:
smaller spur & larger pinion.

thats the best comnparision i have read thanks. makes everything make more sence. Just made my day