there should be very little play between the gears. thats where the sound is most likely coming from.. i mesh my gears by hand. But there should be a very tiny amount of actual play between the gears- just enough to make a small "tink" noise between the gears.
Benjamin White
R/c Monster Team Driver
Jq the car, LST, Sportweks turmoil pro
Unconventional Techniques, Superior Results