And whats a good solid cruising speed for these things? Do they like 2000rpm, 2500, 3k?

Right now with a 5speed, and 30x9.5's and 3.55's I'll be around 2200rpm at 70mph in 5th gear..Kind of disappointing because I won't get much use out of 5th gear.
So I'll try to find some 4cyl jeep axles and swap those in, I would love 4.56's so I can ran 31x10.5's and not loose to much, but I'll take 3.73 or 4.10 as it'll be better than what I have now..


For you jeep guys,
ax15, 30x9.5's, 3.55's - 70mph 2199rpm
ax15, 30x9.5's, 3.73's - 70mph 2310rpm
ax15, 30x9.5's, 4.10's - 70mph 2530rpm
ax15, 30x9.5's, 4.56's - 70mph 2820rpm

ax15, 31x10.5's, 4.56's - 70mph 2750rpm

Those are rough estimates as tires may measure out slightly more/slighty less, using this calculator here.
Gear Ratio Calculator