witht he 4banger you will want 4.56's with 31;s, 4.88's for 32's, or 5.13;s for 33's
and youll keep a crusing speed of around 70 on the freeway...and still top out around 100..on avg you will be about 300rpm over stock on the freeway,but have stockover all power even with the bigger tires
skip motor work on the 4banger, unless you talking making a esslinger type of motor out of it.Run it till something flys out of the bottom and throw a 4.0
in it....
if nothing has been changed out on your truck driveline wise or your drivers door, the door tag in the drivers door will have a code under "axle" then you can look it up here in the tech. libary section on this forum so what what gears you have now...