Most TJ owners do not need a long-arm kit. A quality short-arm 3–4 inch lift clears 33s, corrects the geometry, and costs a fraction of a long-arm conversion. The long-arm earns its money only at the extremes — tall lift, 35s, and serious rock work — so match the kit to how you actually wheel, not a forum build thread.
The TJ's short coil-spring control arms work well through about 3.5 inches. Past that the arms get steep, which shortens the wheelbase on compression and makes the ride harsh and the handling vague. A short-arm lift keeps the factory mounts and swaps springs, shocks, and ideally the arms; a long-arm relocates the lower mounts rearward and runs much longer arms for a flatter, smoother arc.
For 33s and mixed street-and-trail use, a 3–4 inch short-arm kit with adjustable control arms, an adjustable front track bar, and good shocks is the honest answer for the vast majority of TJs. It rides well, holds alignment, and handles real trails.
At 4.5 inches and up, on 35s, for dedicated rock work, the long-arm's flatter geometry buys flex and ride quality a tall short-arm can't match. The cost is a bigger kit, drilling or welding new mounts, and reduced belly clearance from the crossmember.
The adjustable track bar and control arms are what keep the steering safe — they re-center the axle and restore caster. Never lift a TJ without correcting the geometry, or you invite death wobble. Above ~3.5 inches add a slip-yoke eliminator and CV driveshaft for the rear driveline angle. Build short-arm to 33s for almost everyone; reserve the long-arm for the committed 35-inch crawler.
| Part | Vendor | Est. price |
|---|---|---|
| Short-arm lift kit (3-4 in) | Rubicon Express/Rough Country/OME | ~$800 |
| Long-arm conversion kit | Clayton/Rock Krawler | ~$2400 |
| Adjustable front track bar | Currie/Synergy | ~$160 |
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.