17. Most folks run selectable hubs on their front axles, but this 60 is going under an old-school wheeling rig that will run a well-balanced front driveshaft, so we chose some Poly Performance drive slugs. Drive slugs (aka drive flanges) have an inner spline that the axle keys into and an outer spline that keys into the hub, thus transferring the drive from the axleshaft to the hub and wheel. Some drive flanges bolt onto the outside of the hub. These chromoly slugs reduce the worries of broken hubs completely, yet the slugs can easily be pulled and just the caps run if you don't want your front axle spinning constantly.