There are distinct differences bewteen the 60 and the 60-1, hence the 60-1 being used for the higher speed gears like the 3.30 and 3.0, I don't think the average guy could do the machine work needed to move the pinion gear and bearing races over to the drivers side of the car to use the bigger tooth count and wider pinion gears from 60-1 gear sets in a regular 60 housing I don't know how your stock of old 3/4 ton trucks are in your local scrap and junk yards but it may be worth looking for a 60-1 with either gear set in it