Im guessing its a 9 in buty idk could be different I guess. First does the 9 inch have that 4x4 hub lockout knob looking thing at the end of the axle shaft? Some stuff wrote on it are Ford Splicer and the numbers 3094 and 1-585 idk if the 1 is a 1 or l. Inside the carrier are the numbers 0257 on both sides. Also when I turn the axle shaft that has the tire off it turns the driveshaft but not the other tire. But when I turn the side with the tire on it turns the driveshaft and the axleshaft on the opposite side the same way I turn the side with the tire on it. This is in a 78 ford bronco.. Thanks for any help you guys can give me!