Just rebuilt mine after running my Caster Racing all summer. i went a differernt route. I tossed in a 13.5 sensored motor and an 80 amp hobby wing esc. Running 3s lipo the thing is just as much nuts as it was on 4s and the 8th scale motors. I have retired my redcat due to diff issues. I now running the white associated grease in front and rear and the thicker black grease in the middle. My 3 year old is having a blast with it.