52 pick-up,
maybe I can be a little more clear... do a search on "Eaton" and you will find plenty of information about how to swap a later (67-72) rear carrier with 4.10 gears into your 52 axle housing thus giving you a higher top end.
With 31 inch tall tires and a 4.10 rear cruising 60 shouldn't be a problem
you probably have a 4.56 maybe a 5.14 rear. My 53 1 ton has 4.88s for some reason.
hope that helps.
