1978 Ford F Series Trucks Differential Carrier F-150 - 4WD - Dana 44 - Yukon Grizzly Locker - 30 Spline - 3.73 And Down Ratio or Thick Gears - 7/16 in. Bolt holes - Rear guaranteed to replace your current 1978 Ford F Series Trucks Differential Carrier F-150 - 4WD - Dana 44 - Yukon Grizzly Locker - 30 Spline - 3.73 And Down Ratio or Thick Gears - 7/16 in. Bolt holes - Rear. 1978 Ford F Series Trucks Differential Carrier comes new OEM 1978 Ford F Series Trucks Differential Carrier aftermarket new 1978 Ford F Series Trucks Differential Carrier of remanufactured 1978 Ford F Series Trucks Differential Carrier F-150 - 4WD - Dana 44 - Yukon Grizzly Locker - 30 Spline - 3.73 And Down Ratio or Thick Gears - 7/16 in. Bolt holes - Rear.