it depends how you want it to ride. Super Swampers are a good mud tire, but they dont generally ride good.
Most people use bfg tires for street- off roading... i hear they are not lasting long thou anymore
Also depends on what size rims you have
Gears should be changed depending on what size tires you end up with. No gears, its gonna be a turd and hard on the tranny
Just did a chevy straight axle swap and am riding on 4 non balanced 38's not the best ride but not tooooo bad.