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The twisted splines of these output shafts indicate parts not strong enough for an engine's torque and/or the car's traction capability. These shafts were supposedly high-performance aftermarket units, but still failed under high load. On even a moderate-level car, with say 550 rwhp or more, replacing the factory output shafts should be one of the first upgrades performed-as well as the transmission's main shaft. And the more power the car makes, the more important the shafts become. View Related Article
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