there is no 2 speed tranny made for the evader, the RC10GT is a way differenet truck and is made by team associated. yes u can make the spurs fit i think as a guy in the official evader forum did. Maybe your bushing in the backplate has worn and that is where the fuel is coming from, u could get a new backplate, but a OS18cvrx is the best way to go, make sure u get the alloy diff with the OS18 though