1977 Ford F Series Trucks Differential Carrier F-150 - RWD - Ford 9 in. - Yukon Grizzly Locker - 31 Spline - 1.783 in. Diameter Bearing Journals - Fits Load Bolt Housing - Rear guaranteed to replace your current 1977 Ford F Series Trucks Differential Carrier F-150 - RWD - Ford 9 in. - Yukon Grizzly Locker - 31 Spline - 1.783 in. Diameter Bearing Journals - Fits Load Bolt Housing - Rear. 1977 Ford F Series Trucks Differential Carrier comes new OEM 1977 Ford F Series Trucks Differential Carrier aftermarket new 1977 Ford F Series Trucks Differential Carrier of remanufactured 1977 Ford F Series Trucks Differential Carrier F-150 - RWD - Ford 9 in. - Yukon Grizzly Locker - 31 Spline - 1.783 in. Diameter Bearing Journals - Fits Load Bolt Housing - Rear.