Yeah Mark42 you been hiding under a rock? I broke my 10 bolt almost completly striped the pinion people have broken them in practically stock cars...its not the parts it the design its weak...ever seen a stock 10 bolt housing and a moser 12 bolt next to each other the 10 bolt looks like a little toy. 7.5in 10 bolts are junk! It has nothing to do with the quallity of the parts in them, they just arent beefy enough to hold any power...I broke mine doing a burnout...didnt hook until 5th sounded awful...then I continued to beat on it then it went boom.
http://www.njfboa.org/forums/showthread.php?t=48725