If you look at the Load Capacity Charts, in the back of the Operators Manuals, for these 'ol 'bolts, you'll see that it was ordinary for trucks of 1 1/2 ton, & larger, to sometimes be spec'd with tires on the rear, one size larger, than the tires on the front. Example: 7.50 20, on the front, with 8.25 20, on the rear. If it were my truck, I think I'd leave the 8.25's on the rear, & use the link I posted above, for a set of those 7.50's at $85 apiece.
