Redcat is know for having fd up servo setting right out of the box. Make sure yout throttle trim is set to the arrow in the remote. Turn on your remote and rc. Make sure the spring have 1/4 gap from where the servos are is. Then make sure fron locking collar is 1/16 from the servo arm. Rember to use like blue loctite on each collar grub screw! If you set it up like this you hve room for harder braking or higher on gas in carb side.
Also! Redcat servo is garbage! First puddle you will have a run away! Ditch it and use a good 15k servo your whole truck will suffer if you use factor one in time! Hint! Also! Add a remote kill