Super Lift used to made a great 4-5” kit for the "Squared Off Ranger”; I used one on my ’88/5.0, the ride was great.
I ran 32” tire, maybe could have gone larger but got caught up on a set of 32s and left it at that.
Tire size is easy, to keep OEM performance, gears vs tires do this:
(all in inches) (also theory only, nothing is ever so easy)
New gear ratio divided by old gear ratio equals the difference of chg, then multiply that times the old tire size and you get the possible new tire size.
ex: 3.73 / 3.45 = 1.081, 1.081 x 30 (?) = 32 or 33” tires
Only problem is this, there is no way to take into consideration the new tire weight, rotational mass and things along this line other than common sense.
Read about the tires you want vs your old tires, find something close to the old tires in overall weight then maybe the gear change and the increase in tire size will not effect the milage too much.
luck but plan on losing some milage.
4x4, 5sp, Std Cab, Stepside, E4 Red
4” Lift - Coil-Overs, 6” SkyJacker Leafs - No Blocks (Mistake)
31 Spline FX4 Rear Axle, 4.56s and OX Locker, Hurst Shifter w/Optional Stick and "Made by Grev" alignment adapter