the suggested gearing is a little out int he manual for our tracks, I was running a SP 7.5 and suggested gearing was a 19t, settled on a 21t on the end may even try a 22t.
Also there is a point where is says to put button head screws into rear hangers and you need counter sunk.
Other than that its spot on. Car jumps and drives very easily out the box all we did was change the springs for stiffer ones and that helped.
Good car
will post some pics later when i get chance.