1988 Ford F Series Trucks Differential Rebuild Kit F-250 - RWD - Ford 10.25 in. Rear - Differential Rebuild Kit - Includes Timken Bearings, pinion seal, crush sleeve, pinion shims, carrier shims and ring gear bolts. HM807044 inner pinion bearing. - Rear guaranteed to replace your current 1988 Ford F Series Trucks Differential Rebuild Kit F-250 - RWD - Ford 10.25 in. Rear - Differential Rebuild Kit - Includes Timken Bearings, pinion seal, crush sleeve, pinion shims, carrier shims and ring gear bolts. HM807044 inner pinion bearing. - Rear. 1988 Ford F Series Trucks Differential Rebuild Kit comes new OEM 1988 Ford F Series Trucks Differential Rebuild Kit aftermarket new 1988 Ford F Series Trucks Differential Rebuild Kit of remanufactured 1988 Ford F Series Trucks Differential Rebuild Kit F-250 - RWD - Ford 10.25 in. Rear - Differential Rebuild Kit - Includes Timken Bearings, pinion seal, crush sleeve, pinion shims, carrier shims and ring gear bolts. HM807044 inner pinion bearing. - Rear.