1999 Ford F Series Trucks Differential Rebuild Kit F-150 - 4WD - Ford 9.75 in. Rear - Differential Rebuild Kit - Timken Bearings - Universal kit - Includes both M88048 & HM89443 Outer Pinion Bearings - Fits 1.968 in. Diameter Pinion Shaft - Rear guaranteed to replace your current 1999 Ford F Series Trucks Differential Rebuild Kit F-150 - 4WD - Ford 9.75 in. Rear - Differential Rebuild Kit - Timken Bearings - Universal kit - Includes both M88048 & HM89443 Outer Pinion Bearings - Fits 1.968 in. Diameter Pinion Shaft - Rear. 1999 Ford F Series Trucks Differential Rebuild Kit comes new OEM 1999 Ford F Series Trucks Differential Rebuild Kit aftermarket new 1999 Ford F Series Trucks Differential Rebuild Kit of remanufactured 1999 Ford F Series Trucks Differential Rebuild Kit F-150 - 4WD - Ford 9.75 in. Rear - Differential Rebuild Kit - Timken Bearings - Universal kit - Includes both M88048 & HM89443 Outer Pinion Bearings - Fits 1.968 in. Diameter Pinion Shaft - Rear.