If its mostly used for driving roads I would go with 4.56. I have 4.88s and 33's and its to much for going down the hwy. I run about 3200 rpms at 70 in 5th gear with the 3.0L. speaking of which its going to be doing about 800 miles of highway over the next 5 days... Its good for some light cruising around town though. fast acceleration or able to use higher gears for lower speeds. I can do 30mph in 5th pretty easy without touching the gas much and still have decent acceleration if i need it.
1998 Ranger XLT 4x4 Off Road
3.0L 5-speed 33's on 15x8 wheels
4.88 gears, expo L/S 8.8, locker in the front
T-bar crank, chevy drop shackles, and 3" BL
Lots of custom dents and scratches