i have a moser 9in ford in my malibu,it has 35spline axles,full spool and it will hold up 800+hp,if you have the money buy the 9in from moser,or a dealer and you will only have to do this 1 time.the 12bolts will only hold up to 600rwhp,now if your only making that kind of pwer then the 12botl...