- This special drive shaft coupler has 10 splines on one side and 6 splines on the other. It can allow a six spline drive shaft to be attached to a 1932-38 10 spline pinion or this coupler can be welded to a 1932-38 10 spline driveshaft and attached to a pinion that has 6 splines. Drive shaft coupler lock pins are sold separately.