RE: Cen GST 7.7 BRUSHLESS BUILD!
Gear mesh is a difficult thing to get right. I use the paper-strip method mostly, but sometimes adjust it by feel and eye. Insert a strip (or two) of paper inbetween the gears, push together and tighten. Remove paper and gear mesh "should" be perfect. Always look for a little bit of play between pinions and spurs... Good luck! Please remember that this truck was not designed from the onset to be powered by a brushless system, so it will probably never run flawless and smooth. I run mine occasionally only and enjoy the cleanliness of electric power over nitro. Not always easier though...