The 4.0L changed from Renix to High Output in June of 1991
- XJ Upgrades / Tech Write-ups
- Bolt and Nut Hardware Identification
- Brakes
- Drivetrain / Powertrain
- Electrical & Lighting
- Engine
- 99+ Intake Manifold Upgrade
- Air Intakes and Filters
- Camshaft Sprocket Bolt
- Crankshaft pulley-to-vibration damper bolts
- Diagnosing Jeep 4.0L Engine Noise
- Engine Cooling System
- Fuel Systems
- Oil Filter
- Rear Main Seal Replacement
- Spark Plugs - V6 engine only
- Throttle Body Mounting Nuts
- Throttle Body Upgrades
- Troubleshooting No-Start Issues
- What motor mounts do you use?
- Exhaust
- Exterior / Body
- Interior
- Lockers
- On-board Air
- Steering
- Suspension
- Wheels and Tires