Optimized Rear Suspension Control
Upgrade the performance, adjustability, and durability of your Jeep Grand Cherokee WJ (1999-2004) with the Crawl Series Rear Upper Adjustable A-Arm. Designed for lifted Jeeps from 2 to 6 inches, this heavy-duty A-arm delivers precise pinion angle adjustment, enhanced articulation, and unmatched strength for a smoother, more controlled ride both on and off the road.
Key Features Benefits
- Precision Adjustability – Fully adjustable design allows for precise pinion angle correction, reducing vibration and improving drivetrain alignment for optimal performance.
- Heavy-Duty Construction – Built with 1.25-inch threads and .25-inch wall DOM tubing, ensuring maximum strength and long-term durability for extreme off-road conditions.
- Advanced Bracket Design – Includes a laser-cut 1/4-inch steel axle bracket with multiple height settings for customized suspension tuning and improved driveline geometry.
- Superior Articulation Flexibility – Features RockJock Johnny Joints at both ends for bind-free articulation, increased suspension travel, and exceptional durability, far exceeding factory ball joints.
Two-Stage Powder Coating
Every A-Arm undergoes a two-stage powder coating process for superior corrosion resistance and longevity. The zinc primer base coat provides a strong anti-rust barrier, while the durable top coat—available in 10 custom colors—lets you match your build’s style while ensuring maximum protection.
Made in the USA
Proudly manufactured in Orem, UT, the Crawl Series Rear Upper Adjustable A-Arm is a testament to American craftsmanship, designed to outperform and outlast other aftermarket options.
Vehicle Fitment: Jeep Grand Cherokee WJ 99-04 – Enhances rear suspension control by correcting pinion angle, improving articulation, and ensuring smoother operation for lifted setups from 2 to 6 inches.
CORE Advantage: Provides precision driveline alignment, reducing vibrations and optimizing axle positioning. Helps maintain a smooth ride by ensuring correct suspension geometry on-road and off-road.
Adjustability: Fully adjustable for 2 to 6-inch lifts, allowing pinion angle fine-tuning. Includes a laser-cut 1/4-inch steel axle bracket with multiple mounting positions for customized suspension tuning.
Construction: Built from heavy-duty .25” wall DOM tubing with 1.25-inch threaded adjusters and Johnny Joints at both ends, delivering superior flexibility, strength, and articulation over factory components.
Two-Stage Powder Coating: Zinc primer base and top coat available in 10 vibrant colors protect against corrosion and allow for personalized styling of your rig.
Warranty and Origin: Proudly manufactured in the United States, our product includes a lifetime warranty on all non-wear items, providing you with confidence and peace of mind in your purchase.
Built With
Rear Upper A-arm built with 1.5” OD .25” Wall DOM. Welded Johnny Joints on the frame attachment points and a Forged Johnny Joints on the adjustable end with 1.25” x 12 TPI - 2.625” long threads.
| Make | Model | Submodel | Years |
|---|---|---|---|
| Jeep | Grand Cherokee | 1999 - 2004 |
Each rebuild kit includes all necessary components to replace and restore wearable parts.
Construction & Materials
Rear Upper A-arm built with 1.5” OD .25” Wall DOM. Welded Johnny Joints on the frame attachment points and a Forged Johnny Joints on the adjustable end with 1.25” x 12 TPI - 2.625” long threads.
| Vehicle | Jeep Grand Cherokee WJ (99–04) |
| Brand | CORE 4X4 |
| Color | Black or Blue or Charcoal or Green or LightGreen or Orange or Purple or Red or White or Yellow or Custom Color - Other than what is listed above. Extra charge varies. We will reach out after order is placed. |
| Hardware | No Hardware or Complete Kit |
| Series | Crawl Series |
| Placement on Vehicle | Rear Upper, Rear |
| Mounting Style | Bolt-On |
Use the vehicle selector on our website to shop by your year, make, and model. On product pages, use the kit builder to select your color, series, lift height, and any add-on options, then add to cart. If you need help, call or email our team.
Standard orders typically ship within 1–3 business days of ordering. Custom color orders take approximately 5–10 business days. Because everything is built in-house, we can turn orders quickly even for custom specifications.
You can reach our team through the contact form on our website, or browse to the Contact Us page. Our team is available to answer pre-sale and technical questions before and after your purchase.
Reviews of Core 4x4
Specifications
| Color | Black, Blue, Charcoal, Green, LightGreen, Orange, Purple, Red, White, Yellow, Custom Color - Other than what is listed above. Extra charge varies. We will reach out after order is placed. |
| Hardware | No Hardware, Complete Kit |
| Vehicle | Jeep Grand Cherokee WJ (99–04) |
| Brand | CORE 4X4 |
| Series | Crawl Series |
| Note to Core4x4: | - |
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