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19 Although there are a variety of axle types available, you have a basic choice of crowned (right) and straight (left) depending upon what you want the axle to do. And, you must have a corresponding drive plate to go with either the crowned or straight spline axleshaft. Crowned axleshafts can only be used with steel drive plates. The crowned hub axle articulates around its centerline (camber) whereas the straight does not.