1987 Ford F Series Trucks Ring and Pinion Set F-150 - 4WD - Ford 9 in. - Ring and Pinion Set - 4.11 Ratio - 28 Spline Pinion - Rear guaranteed to replace your current 1987 Ford F Series Trucks Ring and Pinion Set F-150 - 4WD - Ford 9 in. - Ring and Pinion Set - 4.11 Ratio - 28 Spline Pinion - Rear. 1987 Ford F Series Trucks Ring and Pinion Set comes new OEM 1987 Ford F Series Trucks Ring and Pinion Set aftermarket new 1987 Ford F Series Trucks Ring and Pinion Set of remanufactured 1987 Ford F Series Trucks Ring and Pinion Set F-150 - 4WD - Ford 9 in. - Ring and Pinion Set - 4.11 Ratio - 28 Spline Pinion - Rear.