I'm starting to feel this topic was misnamed perhaps it should have been named, CEN doesn't care. They have yet to address those of us having issues with the diff gears on the NX series. They want to blame the driver, but it seems that every one that has upgraded to the steel spur and pinion gears have had issues with the diffs now. Why were they plastic spur gears anyway? I'm starting to feel disenfranchised over the whole situation. I never thought that an RC car hobby would cost more than my former REAL car hobby did!!!!!