Made in USA
Orem, Utah
Lifetime Guarantee
Unconditional
10 Colors
In-house powder coat
Fully Adjustable
0-6" of lift
3 X-Series Options
Only Core 4x4
RockJock's Heavy Duty High Steer Knuckle Kit for JL Wrangler, JL Unlimited and JT Gladiator vehicles (with standard Sport width axle) replaces the aluminum factory knuckles and raises your tie rod 2 3/4 in. and your drag link 2 1/2 in.. Currectlync steering that is included in this kit features forged, organically shaped drag link for maximum up travel and a 42mm tie rod. All steering rod ends are forged steel. Additionally, kit includes fully integrated trac bar relocation and steering stabilizer shock mounting bracket that raises your trac bar 2 in. and corrects it's geometry as well as giving you a raised mounting point for your steering stabilizer shock that mounts it dramatically higher, up and behind the new tie rod location, to protect it from rocks. RockJock's fabricated steel tie rod clamp installs to provide and easy hook-up point for the other end of your shock. All other factory outer components retained with the new knuckles including outer axles, unit bearings, dust shields and brakes. The use of RockJock's RJ-9120FJLF forged, organically shaped front trac bar is also strongly encouraged, so that all components nest together for maximum up travel as engineered.
| Make | Model | Submodel | Years |
|---|---|---|---|
| Jeep | Gladiator | 2020 - Present | |
| Jeep | Wrangler | 2018 - Present |
| Vehicle | Jeep Gladiator JT (20–Present) or Jeep Wrangler JL / JLU (18–Present) |
| Brand | RockJock |
Reviews of Core 4x4
5.0
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132 reviews
AH
Abbey Hiett
Mar 25, 2019
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Company finally made things right
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jacob fezza
Mar 24, 2022
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I wanted to take a moment and give these guys a shout out, I’ve currently got, for my xj, their adjustable control arms, tier 4 adjustable track bar and adjustable leaf spring shackles. You can always count on a fair price, high quality products, and quick delivery. Keep up the great work guys, will definitely continue to shop with you
J
Justin
Mar 24, 2021
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Small business, family owned, made in the USA, lifetime warranty. Purchased Tier 3 control arms and rear track bar for a 2006 Jeep LJ. Simple website and easy to contact over phone and email. I had some technical questions and they were happy to answer them. They allow local pickup and were built to order same week. The order was wrapped and ready when I walked in and even gave a tour of the shop. They abrasive blast all raw materials to achieve a better surface profile for powdercoat to adhere and create a smooth, durable finish. I also noticed several CNC machines and a robotic welder they use for all their parts. A small outfit with a robotic welder? Their concern for quality is obvious and it shows in the parts they make. Very impressed. Happy to do business with these guys.
AS
Anthony Snyder
Jun 26, 2025
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Great experience and really great parts
RD
Reagan D'mello
Dec 23, 2025
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Love the product. Excellent customer support 👍🏽 …
DT
Dean Tk421
Feb 21, 2026
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I purchased the Jeep WJ control arms Camp series over a year ago. Very pleased and impressed. Easy installation and solid build. Bracket broke for rear upper control arm, they redesigned it to be more robust and sent me a new one with hardware, honoring their guarantee!
DW
Derek Whitfield
Nov 20, 2025
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Solid product, the lifetime warranty sealed the deal for me. Installed on my TJ and the ride quality improved noticeably. Shipping took a bit longer than expected but the parts were worth the wait.
TM
T Mac
Mar 23, 2026
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CORE 4X4 Company produces/manufactures exceptional products. My rear upper and lower control arms and rear track bar were powder coated custom Fox “Shock Orange” for my 2024 Bronco Wildtrak. OEM looks minimal compared to the CORE 4X4 control arms. Plus they’re adjustable, serviceable and rebuildable. Shipment was very fast and packaging used custom foam wrapped around the arms and heavy duty boxes. Not even UPS could damage. Korby L. was great to work with and responded quickly with emails and product information. Great products. Great people from the State of Utah. All Made in the USA. 5 Stars!!!
JW
Jonathan Word
Aug 25, 2025
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Beefy parts made and painted well, very fair pricing for what you get, and fantastic customer service to boot. Easily my favorite place to get suspension parts.
BB
Brayden Brockey
Mar 23, 2024
★
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Got a set of upper control arms for my xj, really impressed with the quality
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Specifications
| Vehicle | Jeep Gladiator JT (20–Present), Jeep Wrangler JL / JLU (18–Present) |
| Brand | RockJock |