Alot of people look into C4 rear end when swapping LS's into FC's for more strength and more gearing options so you might look into that. Not sure what kind of power they can take but the TII rear can take upwards of 500hp and the C4 swap is said to be a substantial improvement.
But if your looking for strait line traction and grenade proofing, a 12 bolt or 9 inch would probably be a better investment.
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