99 Jeep Grand Cherokee Wiki: Your Comprehensive Guide to the WJ Generation

99 Jeep Grand Cherokee Wiki: Your Comprehensive Guide to the WJ Generation jeeps.truckstrend.com

Welcome to the ultimate "99 Jeep Grand Cherokee Wiki," your definitive resource for understanding, maintaining, and appreciating the iconic 1999 Jeep Grand Cherokee, internally known as the WJ. This vehicle holds a significant place in automotive history, representing a pivotal moment for Jeep as it evolved its beloved Grand Cherokee line. Far more than just a year model, the 1999 Grand Cherokee introduced a complete redesign from its ZJ predecessor, blending rugged off-road capability with a newfound emphasis on on-road refinement, comfort, and safety. For enthusiasts, prospective buyers, and current owners alike, delving into the specifics of this generation is crucial. This wiki-style guide aims to provide a thorough exploration, offering practical advice, detailing key features, and addressing common considerations to help you navigate the world of the 1999 WJ.

I. The Genesis of the WJ: Design and Development

99 Jeep Grand Cherokee Wiki: Your Comprehensive Guide to the WJ Generation

The 1999 Jeep Grand Cherokee (WJ) marked the second generation of the Grand Cherokee lineup, replacing the highly successful ZJ. Launched in 1998 for the 1999 model year, the WJ was an ambitious undertaking for Chrysler (then DaimlerChrysler). While it maintained the distinctive Grand Cherokee silhouette, virtually every component was new.

Jeep engineers focused on creating a vehicle that was more refined, quieter, and safer, without compromising its legendary off-road prowess. The WJ featured an all-new unibody chassis, which was stiffer and lighter than the previous generation, contributing to improved handling and reduced noise, vibration, and harshness (NVH). The suspension system was redesigned, utilizing a new short-and-long-arm (SLA) front suspension and a five-link rear suspension, both coil-sprung, for a more compliant ride. The vehicle also introduced a new rack-and-pinion steering system, enhancing steering precision.

From a design perspective, the WJ was sleeker and more aerodynamic than the ZJ, with smoother lines and a more integrated appearance. The interior was also completely revamped, offering more passenger room, improved ergonomics, and a significant upgrade in material quality and available features.

II. Powertrain Options: Heart of the Beast

The 1999 Grand Cherokee offered two primary engine choices, each catering to different performance needs:

• 4.0L PowerTech I6 Engine (AMC 242): This venerable inline-six, carried over from the ZJ but with refinements, remained the standard engine. Known for its legendary durability, simplicity, and low-end torque, it produced 195 horsepower and 230 lb-ft of torque. It was typically paired with the 42RE 4-speed automatic transmission. While not a powerhouse, its reliability and ease of maintenance made it a popular choice, especially for off-roading where consistent torque delivery is paramount.
• 4.7L PowerTech V8 Engine (SOHC): A significant new addition for the WJ, this all-new single overhead cam V8 engine marked a departure from the traditional pushrod V8s of the past. It delivered a robust 235 horsepower and 295 lb-ft of torque, offering considerably more acceleration and towing capability than the 4.0L. This engine was exclusively mated to the newly developed 45RFE 5-speed automatic transmission (though it initially operated as a 4-speed, the fifth gear was available for later models or under specific conditions). The 4.7L V8 brought a much-needed boost in performance, making the WJ more competitive in the luxury SUV segment.

Transfer Cases: The 1999 WJ introduced advanced four-wheel-drive systems:

• Quadra-Trac II: A full-time 4×4 system utilizing a new generation of NV247 transfer case. It relied on a progressive, speed-sensing limited-slip center differential that could transfer up to 100% of torque to the front or rear axle as needed. This system was a significant improvement over previous part-time systems for on-road all-weather driving.
• Quadra-Drive: The pinnacle of WJ 4×4 capability, available only with the 4.7L V8. Quadra-Drive combined the Quadra-Trac II transfer case with Vari-Lok axles (gerotor-type limited-slip differentials) in both the front and rear. This sophisticated system could automatically transfer nearly 100% of torque to a single wheel if the other three lost traction, offering unparalleled off-road performance for a factory vehicle.

III. Interior and Features: Comfort Meets Capability

The interior of the 1999 Grand Cherokee was a major step up in refinement and design. Jeep aimed for a more upscale feel, with soft-touch materials, improved fit and finish, and a more driver-centric dashboard layout.

Key Interior Features (depending on trim level):

• Laredo: The base trim, still well-equipped with power windows/locks, air conditioning, cruise control, and an AM/FM cassette stereo. Cloth seating was standard, with optional leather.
• Limited: The top-tier trim, offering a wealth of luxury features including leather upholstery, power-adjustable heated front seats, dual-zone automatic climate control, a premium Infinity Gold sound system, woodgrain trim accents, and a steering wheel with integrated audio controls.
• Space and Ergonomics: The WJ offered improved rear legroom compared to the ZJ, making it more comfortable for rear passengers. The cargo area was spacious and easily accessible.
• Safety Features: Standard safety features included dual front airbags, anti-lock brakes (ABS), and a unibody construction designed to absorb impact forces more effectively.

IV. Driving Dynamics and Off-Road Prowess

The 1999 WJ successfully balanced on-road comfort with its legendary off-road heritage.

• On-Road: The new unibody construction, improved suspension, and rack-and-pinion steering contributed to a more car-like driving experience. The ride was smoother and quieter, and handling was more precise, making it a comfortable daily driver.
• Off-Road: Despite its newfound refinement, the WJ remained a highly capable off-road vehicle. With ample ground clearance, short overhangs, and robust solid axles, it could tackle challenging terrain. The Quadra-Drive system, in particular, made it incredibly adept at navigating obstacles where individual wheels might lose traction. Its approach, departure, and breakover angles were impressive for a production SUV.
• Towing Capacity: The 4.7L V8-equipped WJ could tow up to 6,500 lbs (with proper equipment), making it suitable for pulling boats, trailers, or small campers. The 4.0L I6 was rated for around 5,000 lbs.

V. Common Issues and Maintenance Considerations

While robust, the 1999 Grand Cherokee, like any vehicle of its age, has its quirks and common issues that prospective buyers and owners should be aware of:

• Blend Door Issues: A notoriously common problem. The blend doors, which control temperature mixing for the HVAC system, are made of plastic and frequently break, leading to inconsistent or stuck temperature output. Repair often requires dashboard removal, making it a costly fix if not done DIY.
• "Death Wobble": While not exclusive to the WJ, the "death wobble" is a violent, uncontrolled shaking of the front end, typically triggered by hitting a bump at speed. It’s usually caused by worn steering and suspension components (track bar, tie rod ends, ball joints, control arm bushings). Regular inspection and replacement of these parts are crucial.
• 4.0L Engine Issues: Known for its longevity, the 4.0L can develop oil leaks (rear main seal, oil filter adapter), cracked exhaust manifolds, and occasional overheating if the cooling system isn’t meticulously maintained.
• 4.7L Engine Issues: Generally reliable, but can be prone to dropped valve seats if overheated, leading to catastrophic engine failure. Regular coolant flushes and monitoring temperature are vital.
• Transmission Issues: The 45RFE (4.7L) and 42RE (4.0L) are generally durable but benefit from regular fluid and filter changes. Neglect can lead to harsh shifts or slipping.
• Rust: Common on older vehicles, inspect rocker panels, frame rails, and wheel wells for corrosion, especially in regions that use road salt.
• Electrical Gremlins: Minor electrical issues, such as faulty window regulators, intermittent gauge readings, or problems with the alarm system, can occur.
• Driveshaft U-Joints and CV Joints: Listen for clunking or clicking noises, especially when accelerating or turning, indicating worn joints.

Practical Advice: Regular and proactive maintenance is key to the longevity of a 1999 Grand Cherokee. Adhere to fluid change schedules, inspect suspension components frequently, and address any warning signs promptly. The aftermarket support for WJs is excellent, making parts readily available and repairs often manageable for the DIY enthusiast.

VI. Buying a Used 1999 Jeep Grand Cherokee: What to Look For

Purchasing a 1999 WJ requires careful inspection. Here’s a checklist:

1. Vehicle History Report: Obtain a CarFax or AutoCheck report to check for accidents, salvage titles, flood damage, and mileage discrepancies.
2. Rust: Thoroughly inspect the frame, rocker panels, floorboards, and suspension mounting points for rust. Surface rust on the exhaust is common, but structural rust is a deal-breaker.
3. Engine:
   • 4.0L: Check for oil leaks (especially around the rear main seal and oil filter adapter). Listen for exhaust manifold ticks. Check coolant for signs of oil contamination.
   • 4.7L: Listen for unusual ticking or knocking noises, which could indicate valve seat issues. Check coolant for sludge or oil.
4. Transmission: Test drive thoroughly. Ensure smooth shifts in all gears. Check fluid level and condition (should be red, not brown or burnt-smelling).
5. Transfer Case & 4WD: Engage 4WD (if safe to do so) and listen for grinding or clunking. Check for leaks around the transfer case. For Quadra-Drive, ensure the Vari-Lok axles operate correctly (no binding or excessive noise during tight turns).
6. Suspension & Steering: Look for worn bushings, ball joints, and tie rod ends. Test for "death wobble" symptoms during the test drive (though it may not always present itself). Check shocks for leaks.
7. HVAC: Test all climate control functions, ensuring hot and cold air comes from all vents, and the fan works on all settings (checking for blend door issues).
8. Electrical: Test all windows, power locks, radio, lights, and gauges.
9. Tires: Check tire wear for uneven patterns, indicating alignment or suspension issues.
10. Overall Condition: Assess the interior for excessive wear, tears, or stains. Look for signs of neglect.

VII. Modifying Your WJ: Enhancing Performance and Style

The 1999 Grand Cherokee is a popular platform for modification, especially for off-road enthusiasts:

• Lift Kits: Ranging from mild (2-inch spacer lifts) to aggressive (4-inch+ long-arm kits), lifts allow for larger tires and improved ground clearance.
• Tires: Upgrading to all-terrain or mud-terrain tires significantly enhances off-road capability. Common sizes include 31-33 inches.
• Armor: Skid plates, rock sliders, and aftermarket bumpers protect vital components during off-road excursions.
• Engine Performance: Aftermarket air intakes, exhaust systems, and tuners can yield minor power gains. For the 4.7L, superchargers are an option for serious power.
• Drivetrain Upgrades: Stronger axle shafts, lockers, and re-gearing can further enhance off-road performance and durability, especially with larger tires.
• Lighting: Auxiliary LED lights are popular for improved visibility during night trails.

Conclusion

The 1999 Jeep Grand Cherokee (WJ) remains a compelling vehicle, offering a unique blend of rugged capability and surprising on-road refinement. It successfully bridged the gap between traditional utilitarian SUVs and the more comfortable, family-friendly models that would dominate the market. Its robust powertrains, advanced 4×4 systems, and comfortable interior make it a versatile choice, whether for daily commuting, family adventures, or challenging off-road expeditions. While they come with their share of common issues typical of vehicles from their era, diligent maintenance and informed purchasing decisions can ensure a rewarding ownership experience. The 1999 WJ is more than just a used car; it’s a testament to Jeep’s enduring legacy and a solid platform for those seeking a capable and distinctive SUV.

Estimated Price Guide for 1999 Jeep Grand Cherokee (WJ)

The pricing of a 1999 Jeep Grand Cherokee can vary significantly based on condition, mileage, trim level, engine, geographic location, and specific features. This table provides a general estimate.

Condition	Trim Level	Engine Type	Estimated Price Range (USD)	Key Considerations
Poor	Laredo	4.0L I6	$1,000 – $2,500	Significant mechanical issues, heavy rust, cosmetic damage, high mileage. Often suitable for parts or extensive restoration.
	Limited	4.7L V8	$1,500 – $3,000
Fair	Laredo	4.0L I6	$2,500 – $4,000	Running and driving but needs work (e.g., blend doors, suspension components, minor leaks), moderate rust, average mileage (150,000+ miles).
	Limited	4.7L V8	$3,000 – $5,000
Good	Laredo	4.0L I6	$4,000 – $6,000	Mechanically sound, minor cosmetic flaws, minimal rust, well-maintained, average to lower mileage for its age (100,000 – 150,000 miles).
	Limited	4.7L V8	$5,000 – $7,500
Excellent	Laredo	4.0L I6	$6,000 – $9,000+	Meticulously maintained, low mileage (<100,000 miles), no significant mechanical issues, minimal to no rust, pristine interior and exterior. Rare to find in this condition.
	Limited	4.7L V8	$7,500 – $12,000+

Disclaimer: Prices are estimates and subject to market fluctuations, regional demand, and specific vehicle history. A premium may be paid for vehicles with desirable modifications, extensive service records, or rare options. Always get a pre-purchase inspection.

Frequently Asked Questions (FAQ) about the 1999 Jeep Grand Cherokee (WJ)

Q1: Is the 1999 Grand Cherokee (WJ) reliable?
A1: Generally, yes, especially the 4.0L I6 engine which is known for its legendary durability. However, like any vehicle over two decades old, reliability largely depends on past maintenance. Common issues like blend doors and "death wobble" components need attention, but the core mechanicals are robust if cared for.

Q2: What’s the difference between Quadra-Trac II and Quadra-Drive?
A2: Both are full-time 4WD systems. Quadra-Trac II uses a progressive limited-slip center differential to send power to the front or rear axle as needed. Quadra-Drive adds Vari-Lok limited-slip differentials to both the front and rear axles, allowing power to be sent to a single wheel if the other three lose traction. Quadra-Drive offers superior off-road capability.

Q3: What is the "death wobble" and how do I fix it?
A3: "Death wobble" is a violent, uncontrolled oscillation of the front end, usually triggered by hitting a bump at highway speeds. It’s caused by worn or loose steering and suspension components, most commonly the track bar, tie rod ends, ball joints, or control arm bushings. Fixing it involves inspecting and replacing the worn components, often starting with the track bar.

Q4: Which engine is better, the 4.0L or the 4.7L V8?
A4: It depends on your priorities.

• 4.0L I6: Known for extreme reliability, simpler mechanics, and excellent low-end torque. It’s often preferred for serious off-roading due to its simplicity and robust nature. Less power, but usually cheaper to maintain.
• 4.7L V8: Offers significantly more power and torque, making it better for highway driving, acceleration, and towing. However, it’s more complex, can be more expensive to repair if issues arise (like valve seat problems from overheating), and typically uses more fuel.

Q5: Are parts still available for the 1999 Grand Cherokee?
A5: Yes, parts availability is generally excellent. Due to the WJ’s popularity and the long production run of many of its components (especially the 4.0L engine), both OEM and aftermarket parts are readily available through dealerships, auto parts stores, and online retailers.

Q6: What is the towing capacity of the 1999 Grand Cherokee?
A6: The towing capacity varies by engine and equipment:

• 4.0L I6: Approximately 5,000 lbs.
• 4.7L V8: Up to 6,500 lbs (when properly equipped with a tow package).

Q7: What should I look for when buying a used 1999 Grand Cherokee?
A7: Focus on rust (especially frame and rockers), check for common engine leaks (4.0L) or strange noises (4.7L), test the HVAC system for blend door issues, inspect suspension components for "death wobble" causes, and thoroughly test the 4WD system. A pre-purchase inspection by a trusted mechanic is highly recommended.