Rotate every 5,000–7,500 miles using a rearward-cross pattern (non-directional tires) or straight front-to-back (directional tires) — the NP231 doesn't care in 2WD, but even wear keeps you out of a bind the day you actually need 4WD on the highway.
The XJ's part-time transfer case only splits torque to the front axle when you lock it in — most miles are put on in 2WD, which means the rear tires do all the driving work and wear faster than the fronts. Left alone, that mismatch grows until you've got 4/32" up front and 8/32" out back. Run it in 4WD like that on dry pavement and you're fighting the transfer case as it tries to reconcile two axles spinning at different effective diameters — binding, drivetrain windup, and on some transfer cases, real damage. Rotating on schedule keeps all four tires close enough in tread depth that 4WD engagement stays clean.
Steps
Check current tread depth at each tire with a gauge or the penny test. Note the pattern — cupping points to worn shocks or struts, feathering points to a toe problem, and inner-edge wear points to worn track bar or control arm bushings. Rotation won't fix any of those; it just buys you time and even wear until you do.
Loosen all lug nuts about a quarter turn while the tire is still on the ground.
Raise the XJ and support it on jack stands rated for the vehicle's weight. Work one axle at a time if you don't have four stands, or use ramps for a faster front/rear swap without lifting the whole truck.
Remove each wheel and check the lug studs and nuts for damage or corrosion. A light coat of anti-seize on the studs (not the threads inside the nut) makes the next rotation easier and prevents rust-welding, common on XJs that see winter roads.
Non-directional tires (most all-terrains, most stock XJ fitments): run the rearward-cross pattern. Move each front tire straight back to the same-side rear position. Move each rear tire forward to the opposite-side front position (driver rear crosses to passenger front, passenger rear crosses to driver front).
Directional tires (BFG KM3, Nitto Trail Grappler, most aggressive mud-terrains): the tread is designed to rotate one way, so tires can only move front-to-back on the same side — no crossing. Left front to left rear, left rear to left front, same on the right. If you want a true rotation pattern with directional tires, the wheels have to come off the rims and get remounted on the opposite side, which isn't worth the shop cost for a routine rotation.
Reinstall each wheel and thread the lug nuts on by hand to avoid cross-threading. Snug them in a star pattern before lowering the Jeep off the stands.
With the Jeep back on the ground, torque the lug nuts to 80–95 ft-lb (check your specific wheel manufacturer's spec if running aftermarket wheels — some call for less) in a star pattern.
Reset tire pressures to spec for each corner — pressures can vary slightly front to rear on the XJ's factory recommendation, so don't just carry over whatever the old position was set to.
If you run a full-size matching spare, work it into the rotation. A simple five-tire rotation cycle (each tire spends one rotation cycle as the spare) keeps the spare from aging out unused while the road tires wear down — useful since a decade-old spare with full tread is still a decade-old spare when you actually need it.
Why it works
Evens out tread wear across all four corners, which keeps 4WD engagement smooth and avoids drivetrain windup from mismatched tire diameters
Cheap and fast if you're already doing an oil change or other underneath work
A built-in excuse to actually look at brakes, suspension bushings, and CV/U-joint boots every rotation cycle
Extends the useful life of the full set — replacing four tires at once instead of two-now-two-later saves money and avoids a mismatched-tread mixed set
Trade-offs
Directional tread tires limit you to a same-side front-to-back rotation unless you pay to remount them — you lose some of the wear-evening benefit
Doesn't fix an underlying alignment or suspension problem, just spreads the resulting wear pattern around instead of correcting the cause
Working the spare into a five-tire cycle means pulling the spare down and remounting it, which is more hassle than most owners bother with
Tools required
Floor jack and jack stands (or drive-on ramps)
Lug wrench or breaker bar
Torque wrench
Parts
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Written and maintained by an AZ wheeler and driveway wrencher. Always cross-reference your factory service manual — modifications affect vehicle safety and warranty. Work at your own risk.