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I am going to order a new driveshaft Monday from Dynotech and wondering is there any advantage in going with an aluminum one over a steel replacement?

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It depends on what your doing with the car, if you want it to be as fast as posible I have seen many NHRA class cars pick up MPH and reduce ET by using a lighter driveshaft than a heavier one on back to back test A 10 lb. difference in weight loss makes more gain than a 5 lb loss (reduction) does