On my LX Comp I just installed a JP-1 pipe on it and I think my center differential is slipping. When I'm at a comlete stop and give the buggy full throttle the engine revs kinda high, but it accelerates really slow. I took the body off and watched the spur gear and clutch bell and tried acclerating and the spur and clutch bell are spinning quite fast so thats why I think its the diff. How would fix the differential?