1984 Ford F Series Trucks Differential Carrier F-250 - RWD - Dana 60 - Yukon Grizzly Locker - Aftermarket 40 Spline - 4.56 And Up - w/ Full Float Axle - Rear guaranteed to replace your current 1984 Ford F Series Trucks Differential Carrier F-250 - RWD - Dana 60 - Yukon Grizzly Locker - Aftermarket 40 Spline - 4.56 And Up - w/ Full Float Axle - Rear. 1984 Ford F Series Trucks Differential Carrier comes new OEM 1984 Ford F Series Trucks Differential Carrier aftermarket new 1984 Ford F Series Trucks Differential Carrier of remanufactured 1984 Ford F Series Trucks Differential Carrier F-250 - RWD - Dana 60 - Yukon Grizzly Locker - Aftermarket 40 Spline - 4.56 And Up - w/ Full Float Axle - Rear.