The Dana 60 pickup husings come with several different axle tube O.D. and tube thicknesses, that being said the Dana 60 Mopar passenger car Dana 60 had 3.0 inch O.D. tubes. I've been told that the Dana 60 in some of the later 1/2 ton Ford pickup with 5 bolt patten wheels have 3.0 O.D. tubes in them also I've bought two Dana 60 3/4 or 1 ton single wheel housing in the last month from a local junkyard, both of them had the 3 1/8 inch O.D. tubes in them. I'm building a 1966 Coronet deluxe that I bought a Dana 60 out of a van that has 3 1/8 tubes and it cut down fine and fits in that car excellent. I've owned Dana 60 that had 2.5 inch, 3.0, 3 1/8 and 3 1/4 O.D. tubes in them IHTHs