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Description
About the 1998 Jeep Cherokee XJ 4.0L Engine
This is the alternate listing for our 1998 Jeep Cherokee XJ 4.0L engine, sourced from a manual-transmission XJ donor configuration. Experience the proven power of the legendary HO 4.0 Inline-6 with this 1998-sourced engine assembly, positioned for buyers who originally had or want a manual-transmission XJ build.
Important Note: This listing is for the engine only, not the complete 1998 Jeep Cherokee vehicle. The page title references the “1998 XJ” because the engine is sourced specifically from a 1998 XJ donor.
Why a Manual-Donor Variant?
For most XJ Cherokees, the AX-15 5-speed manual transmission was a less-common option compared to the AW4 4-speed automatic. Some buyers specifically want a 1998 4.0 sourced from a manual donor configuration because:
- Engine internals can show different wear patterns when paired with manual transmissions versus automatics, sometimes resulting in cleaner internals in lower-mileage manual configurations
- Manual donor enthusiasts prefer the lineage of an engine that came from a manual-transmission XJ
- AX-15 swap builders often want the engine that originally came with the AX-15 to ensure flywheel and clutch interface consistency
That said, the engine itself is mechanically identical to the automatic-donor variant. The primary differentiation is the donor configuration history.
1998 Jeep Cherokee XJ 4.0L Engine Specifics
The 1998 Jeep Cherokee Classic XJ 4×4 4.0L Engine is a high-performance Inline-6 cylinder engine. It boasts a displacement of 4.0 liters (242 cu in) and 190 horsepower at 4,600 RPM. The engine features a cast iron block and cast iron cylinder head, with sequential multi-port fuel injection (MPFI). This particular variant is sourced from a 1998 XJ Cherokee paired with the AX-15 5-speed manual transmission, providing the original manual-transmission donor configuration.
Compatible Vehicles
This engine is specifically suited for the 1998 Jeep Cherokee Classic XJ. However, it can also fit other Jeep models with similar specifications:
- Jeep Cherokee XJ: 1996 to 2001 (OBD-II era, direct cross-fit)
- Jeep Wrangler TJ: 1997 to 2006 (different intake manifold orientation)
- Jeep Grand Cherokee ZJ: 1996 to 1998 (OBD-II era ZJ)
- Jeep Comanche MJ: With appropriate harness (1998 era)
Please ensure to check the compatibility of your vehicle before purchasing. Cross-installation between Renix-era (1987-1990) and HO-era (1991+) requires harness and ECU changes; this 1998-sourced engine is HO-era and compatible with HO-era applications only.
Key Features
The 1998 Jeep Cherokee Classic XJ 4×4 4.0L Engine is renowned for its durability and reliability. Key features include:
1. High-Performance: With 190 horsepower and 225 lb-ft of torque, this engine delivers solid performance ensuring a smooth and comfortable ride for trail use, daily driving, and light hauling.
2. Fuel Efficiency: Despite its power, the engine is designed to be reasonably fuel-efficient. 1998 XJ Cherokee with 4.0 typically delivers 16 to 19 mpg city / 20 to 23 mpg highway.
3. Durability: The engine’s cast iron block and head contribute to its durability, ensuring it can withstand harsh conditions and last for years. The 7120 head casting used on 1998 production is considered more reliable than the later 0331 casting.
4. Manual Transmission Donor: Originally paired with the AX-15 5-speed manual in a 1998 XJ Cherokee. Ideal for buyers continuing manual-transmission builds or restoring an AX-15-equipped XJ.
5. Off-Road Capabilities: The 4×4 drivetrain origin and torque-rich Inline-6 character make this engine ideal for off-road adventures, providing the low-end power needed for crawling and trail work.
6. Easy Installation: The engine is designed to drop into compatible XJ / TJ / ZJ chassis with appropriate ECU and harness. Simple OHV pushrod design makes installation more straightforward than modern overhead-cam alternatives.
Use Cases
This 1998 XJ 4.0 manual-donor variant is ideal for:
- AX-15 manual transmission XJ owners wanting a matching donor engine
- Manual transmission swap builders continuing manual lineage
- Restorers of manual-transmission 1998 XJ Cherokees
- Budget-conscious enthusiasts wanting the same fundamental 1998-vintage engine at the lower price point
Comparison Across Our Three Jeep 4.0 Listings
| Listing | Price | Differentiation |
|---|---|---|
| Primary 1998 XJ (vaz70) | $800 | 1998 XJ donor, automatic transmission origin (AW4 era) |
| This Listing (vaz71) | $800 | 1998 XJ donor, manual transmission origin (AX-15 era) |
| Main Multi-Year (vaz69) | $1,999 | Multi-year (1991 to 2006), full inspection paperwork, premium documentation |
Drive 1998 XJ vintage energy with this engine. Its power, performance, and durability make it a valuable addition to your XJ project, ensuring an unforgettable driving experience characteristic of Jeep’s legendary “Immortal Six.”
What Is Included, What Is Not Included
| Item | Details |
|---|---|
| INCLUDED | Engine assembly: cast iron block, crank, rods, pistons, camshaft and lifters, cast iron cylinder head with 7120 casting, valve train, oil pan, valve cover, intake manifold (typical), exhaust manifold (typical). |
| NOT INCLUDED | ECU and harness (sold separately, must be 1996-2001 OBD-II compatible), throttle body, alternator, starter, A/C compressor, power steering pump, water pump, thermostat, flywheel and clutch (manual transmission interface), motor mounts, distributor, complete vehicle (this is engine only). |
| Fluids | Drained before shipping. Refill with 10W-30 motor oil. Regular unleaded 87 octane fuel acceptable. |
| Core Note | No core charge. You are not required to return your old engine. |
Vehicle Compatibility
This 1998-sourced 4.0L engine fits the following vehicles:
| Vehicle | Compatibility |
|---|---|
| Jeep Cherokee XJ (1996 to 2001) | Direct OBD-II fit, exact-year match for 1998 XJ |
| Jeep Wrangler TJ (1997 to 2006) | Cross-fit with appropriate intake manifold orientation |
| Jeep Grand Cherokee ZJ (1996 to 1998) | OBD-II era cross-fit |
| Jeep Grand Cherokee WJ (1999 to 2004) | Cross-fit with appropriate ECU calibration |
Manual-transmission applications particularly benefit from this engine’s AX-15 donor lineage.
Condition and Inspection
This 1998 XJ 4.0 engine is sourced from a manual-transmission 1998 Cherokee donor and inspected before shipping:
- Visual inspection of block, head, and oil galleries
- Cylinder head casting code documented (7120 era, pre-0331 problematic casting)
- Manual transmission interface (rear of block) inspected for any damage from clutch failure events
- 1998 manual donor authentication via casting numbers and head stamp
- Donor application photographed (1998 XJ manual transmission origin)
This is positioned as a vintage donor variant rather than a fully-documented and compression-tested premium core. For complete inspection paperwork with compression test results across all 6 cylinders, see our Jeep Cherokee 4.0 Engine for Sale (vaz69) at $1,999.
Why Buy From Vaz Auto Solutions
- 1998 XJ manual-donor sourced for original manual-configuration match
- 7120 head casting documented (pre-0331 era, lower crack risk)
- Manual transmission interface specifically inspected
- Visual inspection completed before shipping
- Cross-link to multiple Jeep 4.0 listings for buyers with different needs
- Free freight pallet to all 50 states, no hidden fees
- No core charge, keep your old engine
- 15 day replacement warranty on manufacturing defects
- Jeep XJ / TJ / AX-15 experienced support team on the phone
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