Yukon uses higher quality materials and better techniques than OEM to ensure a longer lasting spider gear set.Details: Spider gear kit Fit Ford 9 inch open differential with 31 spline axles Includes two side gears, four pinion gears, cross pin shaft, roll pins and spider gear thrust washers 1 Year Warranty Against Manufacturer Defects Sold As A Kit Fits Vehicles: Ford Bronco (1966 - 1986) Ford E-100 1/2 Ton (1968 - 1983) Ford E-150 1/2 Ton (1979 - 1988) Ford E200 3/4 Ton (1968 - 1974) Ford E-250 3/4 Ton (1975 - 1980) Ford F-100 1/2 Ton (1957 - 1983) Ford F-150 1/2 Ton (1968 - 1987) Ford Fairlane (1957 - 1971) Ford Falcon (1960 - 1970) Ford Galaxie (1959 - 1974) Ford Granada (1975 - 1979) Ford LTD (1965 - 1979) Ford Maverick (1970 - 1978) Ford Mustang (1965 - 1973) Ford Ranchero (1957 - 1979) Ford Thunderbird (1955 - 1979) Ford Torino / Gran Torino (1968 - 1976) Lincoln Continental (1957 - 1979) Lincoln Mark III (1968 - 1971) Mercury Comet (1964 - 1977) Mercury Cougar (1967 - 1979) Mercury Grand Marquis (1975 - 1980)