I've have many years experiance but cant figure this one out. My traxxas rustler goes through 3793's like thats its job the shaft and pin that the spur gear are on. my father runs the same car as me with the same gearing and tires and hasnt ever had one go bad. I've gone through plenty. I even bought a brand new trans and i still have the issue. what could be causing this. the pin either sheers right off or the pin just stays in but the gear moves out and the pin rotates free. what keeps this thing in. It certainly isnt friction in every case. seems every parts different. some hug snug others are very lose. are these just crap rejects from traxxas? shouldnt they all be tight. i hope someone has answers. am i running my clutch to tight when it snaps and too lose with it lets it rotate?