[Mike C]

3.08 and a 30” tire will be fine on the highway. My 307 in my 69 short step has plenty of gear for it’s pathetic output with 3.08’s in the back.

You should be able to get gears and a limited slip in your truck for $1000. $500 in parts and $500 in labor. Check out Quick Performance on eBay where they sell Yukon LSD but don’t say Yukon in the ad for the $300 range. Elite gears I have had good luck with as well.

Quick can build you a 9” as well if that’s how you plan to go. If you REALLY are going to make 500+ hp and hook it up, you need positive axle retention and beefier shafts. So 9” or Dana 60 is the way to go.