1980 Ford F Series Trucks Differential Carrier F-350 - 4WD - Dana 50 - IFS - 30 Spline - Yukon Grizzly Locker - 30 Spline - Requires IFS Spring Kit YSPSPR-001 - Front guaranteed to replace your current 1980 Ford F Series Trucks Differential Carrier F-350 - 4WD - Dana 50 - IFS - 30 Spline - Yukon Grizzly Locker - 30 Spline - Requires IFS Spring Kit YSPSPR-001 - Front. 1980 Ford F Series Trucks Differential Carrier comes new OEM 1980 Ford F Series Trucks Differential Carrier aftermarket new 1980 Ford F Series Trucks Differential Carrier of remanufactured 1980 Ford F Series Trucks Differential Carrier F-350 - 4WD - Dana 50 - IFS - 30 Spline - Yukon Grizzly Locker - 30 Spline - Requires IFS Spring Kit YSPSPR-001 - Front.