I'm currently running 3 gear. Have tried switching back to 4 gear on some lower grip tracks (most would probably consider them NO grip) and couldn't stand the feel of the truck either jumping or particularly while braking or at corner entry. To me, 3 gear feels better on all levels of grip. I have seen guys with 4 gears or rear motors close the gap on me when the grip comes down but I still stick with the 3 gear because, to me, it's funner to drive.