trick, I am pounding my car. I dunno know why people are screwing up the spurs. Nor do I know how long it takes them to blow one up. I would not expect any spur to last super on the high biter surface I am running on with a 6.5. The guy that owned this d413 before me, blew the spur because he only messed up on half the pinion. So he had way less contact area. Also, once your pinion started to get worn you, need to replace or it will just start chewing up spurs.