The 1999 Jeep Grand Cherokee, often referred to as the ZJ, holds a special place in the hearts of off-road enthusiasts and daily drivers alike. Its blend of rugged capability, comfortable interior, and classic Jeep styling makes it a popular choice for those looking to build a reliable and versatile vehicle. One of the greatest aspects of owning a ZJ is the vast array of aftermarket parts available to customize and enhance its performance, appearance, and functionality. This guide will delve into the world of 99 Jeep Grand Cherokee aftermarket parts, providing you with the knowledge to transform your ZJ into the ultimate expression of your needs and desires.
I. Why Upgrade Your 99 Jeep Grand Cherokee?
Unleash Your ZJ: A Comprehensive Guide to 99 Jeep Grand Cherokee Aftermarket Parts
Before diving into specific parts, let's consider the reasons why you might want to upgrade your ZJ. The stock 99 Grand Cherokee, while capable, has limitations that aftermarket parts can address. These reasons include:
- Improved Off-Road Performance: Factory suspensions and tires are often designed for on-road comfort and fuel efficiency, sacrificing off-road prowess. Aftermarket upgrades can significantly improve articulation, ground clearance, and traction.
- Enhanced Durability: Older vehicles, like the '99 Grand Cherokee, can benefit from replacing worn or aging components with stronger, more durable aftermarket alternatives.
- Personalized Style: From aggressive bumpers to custom wheels, aftermarket parts allow you to express your individual style and make your ZJ stand out from the crowd.
- Increased Functionality: Additions like roof racks, cargo carriers, and auxiliary lighting can dramatically increase the practicality and versatility of your vehicle.
- Performance Gains: Upgrading components like the exhaust system, air intake, and engine management can boost horsepower and torque.
II. Suspension Upgrades: Lift Kits, Shocks, and Springs
The suspension is the cornerstone of off-road performance and ride quality. Upgrading your 99 Grand Cherokee's suspension can transform its capabilities.
- Lift Kits: Lift kits increase ground clearance, allowing for larger tires and improved obstacle clearance. They come in various sizes, from budget-friendly 2-inch kits to more aggressive 4-inch or higher setups.
- Budget Boost (2-inch): Simple and affordable, typically involving coil spring spacers. Ideal for mild off-roading and larger tires.
- Short Arm Lift (3-4.5 inch): Uses longer coil springs and sometimes extended sway bar links. Provides better articulation than a budget boost.
- Long Arm Lift (4.5+ inch): Offers the most significant improvement in articulation and ride quality. Requires welding and more extensive modifications.
- Considerations:
- Intended Use: How often and how aggressively will you be off-roading?
- Budget: Lift kits vary significantly in price.
- Installation Difficulty: Some kits require professional installation.
- Driveline Angle: Lifting a ZJ can affect driveline angles, potentially leading to vibrations. Corrective measures like transfer case drops or adjustable control arms may be necessary.
- Shocks: Aftermarket shocks improve ride quality and control, both on and off-road.
- Types: Monotube, twin-tube, remote reservoir.
- Brands: Bilstein, Fox, Rancho.
- Considerations: Match the shocks to your lift height and driving style.
- Springs: Upgrading springs can improve load-carrying capacity and ride quality.
- Types: Coil springs, leaf springs (for rear).
- Considerations: Choose springs with the appropriate spring rate for your vehicle's weight and intended use.
III. Wheels and Tires: Traction and Style
Wheels and tires are crucial for both performance and aesthetics.
- Tires: Selecting the right tires depends on your driving conditions.
- All-Terrain (AT): A good compromise between on-road comfort and off-road traction.
- Mud-Terrain (MT): Aggressive tread patterns designed for maximum traction in mud and loose terrain.
- Considerations: Tire size, load rating, tread pattern, and noise level.
- Wheels: Aftermarket wheels offer various styles and offsets.
- Steel Wheels: Durable and affordable, ideal for off-roading.
- Aluminum Alloy Wheels: Lighter than steel, improving fuel economy and handling.
- Considerations: Wheel size, bolt pattern, offset, and backspacing. Ensure the wheels are compatible with your ZJ and tire size.
IV. Bumpers and Armor: Protection and Functionality
Protect your ZJ with durable bumpers and armor.
- Front Bumpers: Aftermarket front bumpers offer improved protection, winch mounting capabilities, and aggressive styling.
- Steel Bumpers: Provide maximum protection and durability.
- Tube Bumpers: Lighter than steel bumpers, offering a more minimalist look.
- Considerations: Winch compatibility, approach angle, and weight.
- Rear Bumpers: Similar to front bumpers, rear bumpers offer protection and can include tire carriers and recovery points.
- Rock Sliders: Protect your rocker panels from damage when off-roading.
- Skid Plates: Shield vulnerable components like the fuel tank, transfer case, and oil pan.
V. Drivetrain Upgrades: Strengthening the Weak Points
The drivetrain can be a weak point in heavily modified ZJs. Consider these upgrades:
- Axle Upgrades: Strengthen your axles with chromoly axle shafts and heavy-duty differentials.
- Gear Ratio Changes: Re-gearing can improve performance with larger tires.
- Transfer Case Upgrades: Replace or rebuild your transfer case with stronger components.
- Driveshafts: Upgrade to heavy-duty driveshafts to handle increased power and driveline angles.
VI. Engine and Performance Upgrades: Power and Efficiency
Enhance your engine's performance with these upgrades:
- Cold Air Intake: Improves airflow to the engine, potentially increasing horsepower and torque.
- Exhaust System: Upgrading to a cat-back or header-back exhaust system can improve exhaust flow and engine sound.
- Throttle Body Spacer: Increases intake velocity for a slight performance boost.
- Performance Chip/Tuner: Optimizes engine parameters for improved performance and fuel economy.
- Considerations: Ensure upgrades are compatible with your engine type (4.0L inline-six or 5.2L/5.9L V8).
VII. Interior Upgrades: Comfort and Convenience
Enhance your ZJ's interior with these upgrades:
- Seat Covers: Protect your seats and add style.
- Floor Liners: Protect your carpets from dirt and mud.
- Sound System: Upgrade your stereo for better sound quality.
- Center Console Organizer: Keep your belongings organized.
VIII. Lighting Upgrades: Visibility and Safety
Improve visibility with these lighting upgrades:
- LED Headlights: Brighter and more efficient than halogen headlights.
- Auxiliary Lights: Add off-road lights for improved visibility in dark conditions.
- Fog Lights: Improve visibility in foggy or rainy conditions.
IX. Installation Tips and Considerations:
- Research: Before purchasing any parts, research compatibility and read reviews.
- Tools: Ensure you have the necessary tools for the installation.
- Safety: Wear safety glasses and gloves.
- Torque Specifications: Use a torque wrench and follow the manufacturer's torque specifications.
- Professional Installation: If you are not comfortable performing the installation yourself, seek professional help.
X. Price Table
| Part Category | Example Part | Estimated Price Range |
|---|---|---|
| Lift Kits | 2" Budget Boost Kit | $150 - $300 |
| 3.5" Short Arm Lift Kit | $500 - $1200 | |
| 4.5" Long Arm Lift Kit | $1500 - $3000 | |
| Shocks | Bilstein 5100 Series Shocks (Set of 4) | $300 - $600 |
| Tires | 31x10.5R15 BFGoodrich All-Terrain T/A KO2 | $150 - $250 per tire |
| Wheels | 15x8 Steel Wheels (Set of 4) | $200 - $400 |
| Front Bumpers | Smittybilt XRC Front Bumper | $400 - $800 |
| Rear Bumpers | JCR Offroad Rear Bumper w/ Tire Carrier | $800 - $1500 |
| Rock Sliders | N-Fab Rock Rails | $300 - $600 |
| Skid Plates | Skid Row Offroad Engine/Transmission Skid Plate | $200 - $400 |
| Cold Air Intake | K&N Cold Air Intake Kit | $200 - $400 |
| Exhaust System | Magnaflow Cat-Back Exhaust System | $300 - $600 |
| LED Headlights | Truck-Lite LED Headlights | $200 - $400 per pair |
| Seat Covers | Coverking Seat Covers | $150 - $300 per row |
XI. Frequently Asked Questions (FAQ)
- Q: What's the best lift kit for my 99 Grand Cherokee?
- A: It depends on your budget and intended use. A budget boost is great for mild off-roading, while a long arm lift offers the best articulation for more serious trails.
- Q: What size tires can I fit with a 2-inch lift?
- A: Typically, you can fit 31-inch tires with minimal trimming.
- Q: Will lifting my ZJ affect my fuel economy?
- A: Yes, lifting your ZJ and installing larger tires can decrease fuel economy due to increased weight and rolling resistance.
- Q: Do I need to re-gear after lifting my ZJ and installing larger tires?
- A: Re-gearing is recommended for larger tires (33 inches or more) to restore optimal performance.
- Q: Where can I find reliable aftermarket parts for my ZJ?
- A: Reputable online retailers include Quadratec, Morris 4x4 Center, and Summit Racing. Local off-road shops are also a great resource.
XII. Conclusion
Upgrading your 1999 Jeep Grand Cherokee with aftermarket parts is a rewarding experience that can dramatically improve its performance, appearance, and functionality. By carefully considering your needs and budget, you can transform your ZJ into the perfect vehicle for your adventures, whether they take you on challenging trails or simply down the road in style. Remember to research thoroughly, plan your upgrades carefully, and enjoy the process of building your dream ZJ.
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