when I am racing my truck the servo when turned right stays a little right and when I turn left it stays left so I am having to adjust the steering all the time cause it wont center. How do I get it to center all by itself when I let go of the wheel on the radio ?

I am using a 300 spectrum receiver
rx3s radio.
losi servo and spectrum 6040 servos having issue with all units could it be the radio settings ??
any help or ideas Thanks

sounds like you might have mechanical binding in the steering's servo saver or the servo is too weak for the application... depends on what it's in of course. 2WD 1/10 scale should be fine, if it's 4WD or 1/8 scale maybe not.