New here sayin hello. Be rooten around for awhile. Well the tqi reciver or sv2 esc craped out today.Steering but no throttle. Went to Lhs picked up a duratrax 3900 combo and new rx. Changed out esc no luck, changed rx no luck ,New ecs + rx did the trick. So the cc 4600 does well on a 18/83 2s. Would the 3900 be a upgrade with same gears on a 5 lb rustler. Runing grass and gravel no road use.