RE: My First R/C Car.
the 311 is the one that comes on the throttle stock, its $8 servo... the 605 is usually whatcomes with steering, so mines set up as of now with a 645 on steering and the 605 on throttle
the 311 is junk, you may save it for a later project and just use it as a sort of actuator ... but byinlarge its useless