I have one in my challenger, really like the difference it made. I replaced a good 18spline with it, and the reduction in highway cruising rpm made my car much more enjoyable. Rpm at 75 mph dropped from 3450 to 2750. Gear ratio spread between the gears feels much better than the factory OD with it's "granny" gear first (ran one of those a while). Other than a being little more "gear noisy" than the 18 spline, it's way better. Hoping this is only due to "break in", though I do have a couple thousand miles on it now. Good gear ratio, speed RPM calculator here: https://www.crawlpedia.com/rpm_gear_calculator.htm