5 lug front sounds like a 4400, 6 lug rear, is it a 2 speed? sounds like it was swapped out, as they should have matched from the factory (4400 should have used the 5 in front and 10 in rear, same pattern, 10 holes in all wheels, but only used 5 of them in front). I have not seen a 4400 with 6 bolt wheels, but I am not an expert on the big bolts, there are others with way more experience than me! (and way more trucks!)
