The Cummins planet is steel. But your output shaft has to have the correct spline angle to work. The amount of aluminum that came of the the ones we've hurt was gradual. Never saw much shrapnel. Over rev? A race car without a top end rpm limiter? Doug
Do you know how I would check for the correct spline type for the Cummins planetary? I know there are early and late shafts, mine is the later (bigger) type.
