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I'd think the input shafts would see more fatigue than this control arm. The input shaft is transfering all the power and torque from the engine to the transmission. If they were brittle, they...

It is a process in which to harden metals. I've had stock input shafts for dodge NV4500's cyro'd and they will hold 650+hp in a dual disc clutch sled pulling/drag racing. The process really works.
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Nice work! I wonder if you have the pieces cyro'd after you finish them if that would make them strong enough to not worry about?