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Strange offers transmission slip-yokes for every conceivable application in both mild steel and 4130 chrome-moly. They set us up with a chrome-moly unit to mate up with Project Fox's TH400, which has been heat treated for improved tensile strength. Much like balancing a tire, all Strange driveshafts are spun up to high speeds on a balancer, and weights are welded into place at just the right spots to smooth out vibrations. While most stock driveshafts are only balanced to 3,500 rpm or so, Strange balances its shafts up to 7,500 rpm depending on their intended use. Excessive vibration leads to both breakage and parasitic power loss.