there should be a tin tag on the pig some say 9-L 3.50 or some thing like that 9 inch L limited slip and 3.50 gear if you find one you hit the ford 9 inch lotto .i would get all mine from one yard and they are hard to find with Limited slip but have seen them in trucks 31 spine and limited and bonco s ford vans sometimes have them to but are 28 spine. they sell them to me at $75.each but not no more they now crush them