1968 Ford F Series Trucks Ring and Pinion Set F-100 - Ford 9 in. - Ring and Pinion Set - 4.86 Ratio - 9310 Pro Gear - 28 Spline Pinion - Rear guaranteed to replace your current 1968 Ford F Series Trucks Ring and Pinion Set F-100 - Ford 9 in. - Ring and Pinion Set - 4.86 Ratio - 9310 Pro Gear - 28 Spline Pinion - Rear. 1968 Ford F Series Trucks Ring and Pinion Set comes new OEM 1968 Ford F Series Trucks Ring and Pinion Set aftermarket new 1968 Ford F Series Trucks Ring and Pinion Set of remanufactured 1968 Ford F Series Trucks Ring and Pinion Set F-100 - Ford 9 in. - Ring and Pinion Set - 4.86 Ratio - 9310 Pro Gear - 28 Spline Pinion - Rear.