XJ · 1984–2001 (US); international production continued to 2014
The packaging landmark: a unibody Jeep that didn't ask permission
The XJ was Jeep's first genuinely all-new design since the 1963 SJ Wagoneer, and its defining engineering claim is a packaging trick, not a power figure: built with a fully integrated unibody, it was 1,200 lb lighter, 31 in shorter, 6 in narrower, and 4 in lower than the SJ Cherokee it replaced — while retaining roughly 90% of that predecessor's interior volume. François Castaing is widely credited as its "father" (see /people/francois-castaing). It outlived its own corporate parent, AMC, by over a decade.
United States market and production years. International XJ production (2001–2014) is out of scope for this profile — see /licensed-production for the foreign-branch treatment this framework requires.
CoverageGeneration tracer-bullet · 19 July 2026
Powertrain
Engine options
| Engine | Years | Power | Torque |
|---|---|---|---|
| 2.5L I4 (150 cid, carbureted) | 1984–1985 | 105 hp @ 5000 rpm | 132 lb-ft @ 2800 rpm |
| 2.5L I4 (150 cid, throttle-body injection) | 1986 | 117 hp @ 5000 rpm | 135 lb-ft @ 3500 rpm |
| 2.8L GM V6 (carbureted) | 1984–1986 | 115 hp @ 4800 rpm | 145 lb-ft @ 2400 rpm |
| 4.0L I6, Renix fuel injection | 1987–1990 | 177 hp | 224 lb-ft |
| 4.0L I6 "HO" (High Output) | 1991–2001 | 190 hp | 225 lb-ft |
Configuration
Trims and transmissions
Trim levels multiplied across the run — Base, Chief, Laredo, Pioneer, Limited, Sport, Briarwood, Country, SE, and Classic all appeared at different points between 1984 and 2001. Transmissions split cleanly by engine family: the AX5 5-speed manual paired with the 2.5L I4 and 2.8L V6; the AX15 5-speed manual (and, for 2000–2001 SE models, the New Venture NV3550) paired with the 4.0L I6; automatics were the 30RH 3-speed (2.5L I4) or the Aisin AW4 4-speed, electronically controlled, standard on 4.0L cars from 1988 on.
Identify & buy
Identification and ownership notes
The single highest-value XJ identification fact: know whether your 4.0L runs Renix fuel injection (1987–1990) or HO injection (1991–2001) before ordering sensors, injectors, or wiring — the two systems are not interchangeable parts-for-parts despite sharing the same displacement and general architecture. On the buying side, because the XJ has no separate frame, rust at the rockers, floor pans, and control-arm mounts is structural, not cosmetic — see /buyer-guide for the full inspection technique, and /decode/vin for the 17-character VIN this entire generation falls under.