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Or go with a semi floater 14 bolt from a 88-98 Chevy 6 lug rear instead of buying new wheels and tires. The 10 bolt front end that is 8 lug that you speak of is the same axle as the front, just different spindles, caliper mounts, and rotors.

Oh and FWIW, expect to pay ~125-150 per axle in gears, plus another 125 in an install kit per axle in parts. Couple that with gear oil/parts cleaner/silicone. That's to do it right. And it'll be a days project or so to do them both.

I wouldn't recommend it to anyone who's only done simple repairs and maintenance. It's a lot more involved than simply replacing parts. You can get away with just a runout gauge and a spare "opened" pinion bearing. But for most people, it's easier to replace the entire assemblies out.

Nut is right, except for the gear ratio. 3.55 is a ford ratio. Closest GM ratio for the 8.5" 10 bolt is 3.42. Next option is the 3.73. 3.42's would get you almost back to the same cruise RPM as the 3.08/30" tire. But it'd be about 100rpms slower at 65mph. With the power the 6.2 puts out...