Good question Kip
46 was the 1st year for the 8 lug 3/4 ton. It is quite possible that he has a earlier pickup that has been titled as a 46. If He has an 8 lug rear end, the info I gave above would be correct. If he has a 6 lug rear, I would think the information about the 67-72 3/4 ton rear ends would be useless.
