Hi just changed the rear diff. oil last weekend and it took about 2.7 quarts to fill it back up. Does this sound right. How much should it take. I've got the 2002 6.0 4x4 crewcab. I've searched everywhere on this forum and can't find it, any help would be appriciated. I know the 11.5" rear ends the D-max's and 8.1's have are taking 4 or 5 quarts.