Made in USA
Orem, Utah
Lifetime Guarantee
Unconditional
10 Colors
In-house powder coat
Ships in 3 Days
From our UT facility
Fully Adjustable
0-6" of lift
3 X-Series Options
Only Core 4x4
Transform Your Jeep’s Suspension for Maximum Off-Road Dominance
Take your 2007-2018 Jeep Wrangler JK to the next level with the CORE 4X4 JK Long Arm Kit (J-JK-C-LAK8)—a massive suspension upgrade that enhances articulation, ride quality, axle stability, and durability. This weld-on kit completely redefines your Jeep’s suspension geometry, delivering a longer arc of travel for smoother suspension movement, better traction, and unmatched off-road capability.
Designed for serious off-roaders, this kit features massively upgraded bracketry, extended-length control arms, and industry-leading materials for a stronger, more controlled, and more capable suspension system. Whether you're conquering extreme rock crawls, desert trails, or rugged terrain, this long arm kit provides unparalleled handling and durability.
What’s Included in the Kit?
- Front lower long arms (7075 aluminum, 2” OD) – Maximum strength and flexibility with impact-resistant memory.
- Rear lower long arms (7075 aluminum, 2” OD) – Built for extreme off-road abuse while maintaining ride quality.
- Front upper long arms (steel, 1.5” DOM with frame clearance bend) – Designed for precise fitment with necessary bends for frame clearance.
- Rear upper long arms (7075 aluminum, 1.5” OD) – Lightweight yet incredibly strong for consistent suspension control.
- Left and right front frame brackets (3/16” steel, weld-on) – Engineered for maximum durability and precise suspension geometry.
- Left and right rear frame brackets with integrated body mount relocation (3/16” steel, weld-on) – Reinforces suspension mounting points while ensuring proper body mount positioning for maximum clearance and articulation.
- Complete installation hardware – High-strength bolts, nuts, and washers for a secure and reliable installation.
Key Features and Benefits
- Unmatched suspension travel geometry optimization – The true long arm design extends the control arm mounting points, allowing for a longer arc of suspension travel. This results in a smoother ride, better flex, and superior traction across all terrains. Reduces axle steer and bump steer, improving both high-speed stability and low-speed crawling performance.
- Ultra-strong 7075 aluminum control arms with ‘memory’ – Constructed from massive 2-inch and 1.5-inch 7075 aluminum, these control arms offer a perfect blend of lightweight durability and flexibility. The ‘memory’ of 7075 aluminum means that when impacted off-road, the arms flex and return to their original shape rather than permanently bending—ensuring consistent suspension geometry and long-term reliability.
- Precision-welded 3/16” steel brackets for maximum durability – All frame and body mount brackets are laser-cut and precision-bent from 3/16” steel, delivering an unbreakable mounting system that eliminates flex and provides rock-solid stability. The rear frame brackets integrate body mount relocation, eliminating interference issues while reinforcing your Jeep’s structure.
- Full-width axle compatibility steel arm option – For optimal tire clearance and improved suspension geometry, full-width axles are recommended with 7075 aluminum control arms. For those retaining factory-sized axles, we offer a steel control arm option with optimized bends to ensure proper clearance and fitment.
- Weld-on installation for a permanent performance upgrade – This kit requires cutting and welding for installation, ensuring a permanent and incredibly strong suspension system. Professional installation is recommended for the best results.
Two-Stage Powder Coating for Maximum Durability
All control arms undergo a two-stage powder coating process for enhanced corrosion resistance and customization. This process includes a zinc primer base coat to prevent rust and extend longevity, followed by a top coat available in 10 colors to match your Jeep’s aesthetics. Brackets come raw steel to ensure proper welding after installation.
Proudly Made in the USA
At CORE 4X4, we manufacture our Long Arm Kits in Orem, UT, using only the highest quality American-sourced materials. Our commitment to strict quality control, rigorous testing, and precision engineering ensures every component is built to handle the toughest off-road conditions. By choosing CORE 4X4, you’re supporting American manufacturing and getting an unmatched product that delivers lasting performance.
Final Thoughts
The CORE 4X4 JK Long Arm Kit (J-JK-C-LAK8) is the ultimate suspension upgrade for Jeep Wrangler JK owners looking to push their off-road performance to new heights. With extended-length control arms, precision-engineered bracketry, and 7075 aluminum’s impact-resistant memory, this kit delivers maximum articulation, axle stability, and durability. Upgrade your Jeep Wrangler JK today with the CORE 4X4 Long Arm Kit and experience next-level suspension performance and ride quality, whether on the trail or the road!
| Make | Model | Submodel | Years |
|---|---|---|---|
| Jeep | Wrangler | 2007 - 2018 |
Each rebuild kit includes all necessary components to replace and restore wearable parts.
Master Rebuild kit for J-JK-C-LAK8
$ 294.00
Master Rebuild kit for J-JK-R-LAK4
$ 168.00
Master Rebuild kit for J-JK-F-LAK4
$ 126.00
| Vehicle | Jeep Wrangler JK / JKU (07–18) |
| Brand | CORE 4X4 |
| Color | Black or Blue or Charcoal or Green or Light Green or Orange or Purple or Red or White or Yellow or Raw Aluminum or Custom Color - Other than what is listed above. Extra charge varies. We will reach out after order is placed. |
| Axle Setup | Full Width Front Axle (Aluminum Lowers) or Less than 70" axles (Bent Steel Lowers) |
Select your lift size in Step 1 — the kit ships with the correct geometry for that height. If you’re running a non-standard setup, call us before ordering and we’ll confirm compatibility.
Death wobble is a geometry problem, not just worn parts. Cruise Series corrects caster angle and eliminates the flex points that let shimmy start. Replacing one part at a time delays the fix — this replaces the geometry.
Yes, if you’ve done a lift kit before. Full-day project. Watch the complete JT install walkthrough on our YouTube channel — most owners wrap it in a day. Any off-road shop can run it if you’d rather have it done.
Any non-wear component fails — we replace it. No mileage cap. No maintenance intervals to track. No fine print about voiding if you miss a service. Lifetime means lifetime.
Teraflex’s lifetime warranty voids if you miss a maintenance interval. MetalCloak’s actual parts warranty is 12 months — their “lifetime” language refers to their service program. No conditions here.
See It Installed
Install videos and build guides on our YouTube channel.
Watch more installs on YouTube
Reviews from Google
5.0
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132 reviews
GC
Grant Chaisson
Jun 26, 2025
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These guys are awesome!! They have helped me build multiple jeeps from zjs to mjs and now with my lj build they all ways impress.
There products are the best on the market in my eyes. The best part about it all is it's all made right here in american and shipped anywhere in the world 🌎 .
Don't think twice when your looking for control arm or lift kits for your vehicle if these guys sell it BUY IT!!!
JH
Joe Hu
Sep 24, 2025
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Amazing! I put all my new control arms and it drives a lot smoother and looks great!!!
DN
Devan Nelson
Mar 25, 2019
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Had a great experience with Core 4x4, I desperately needed a custom track bar and found out just a couple days before Easter Jeep Safari. Spence was a huge help and made it happen with plenty of time to spare. Their parts are top notch!
SA
Samuel “SamDaman904” Anscher
Mar 23, 2024
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I meant to put this reviewing about a year ago now, but ever since I’ve had the core 4 x 4, upper and lower control arms on my 2017 ram 1500, they have worked flawlessly leave been on many offering chips, and I’ll definitely be buying new accessories from them in the future and their new upper control arms that they’re offering for all of the ram trucks. Fantastic customer service fantastic health very automotive, off-road, friendly, and any aftermarket thing for your truck or SUV that they currently have!
WT
William Turton
Nov 23, 2025
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Finally a company with a great product and customer service to match. I changed my order last minute from short arms to long arms. The lift is extremely well built. Korbey was awesome! Highly
recommend Core 4x4
RH
Rex Hodges
Jun 26, 2025
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After ordering an upper and lower adjustable control arm kit manufactured by CORE 4X4 from a jeep parts distributor who's intials are E.T., they came with 3 of the threaded ends missing. After over 2 months of phone calls and emails to this E.T. company nothing was resolved. I finally decided to call CORE 4X4 myself and tell them my dilemma. I spoke with a very personable and professional gentleman named Korby, who is one of CORE 4X4's representatives, after a brief discussion of what I went thru he simply asked me for a picture and some measurements and the items I was missing and asked if I could cover ONLY the cost of shipping and I had my missing parts in exactly 1 weeks time. This company not only builds all it's parts in the U.S.A., they stand behind their products with great customer service and life time warranty. My experience with this company and their Rep Korby was fantastic. I would definitely recommend CORE 4X4 to anyone who needs parts for any 4x4 projects. You just can't beat their quality and service.
Rex Hodges
Valparaiso, Indiana
TG
Travis Grimm
Mar 23, 2024
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To start off if you're looking to upgrade your control arms definitely hit this company up. Great product, easy install of the product, with three different tiers everything is priced pretty good, I'm a sticker guy and they sent a sticker for each arm each track bar and also three extra ones so the extra are on the Jeep the advertise them for sure. If you're reading this review I highly recommend you to check their website out.
BA
bryan angell
Jun 26, 2025
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First off amazing products. I got a set of adjustable control arms for my XJ and it is so nice to be able to dial in caster and pinion angles. A quick call and I was able to purchase an adjustable track.
LS
Leonard Smith
Jan 22, 2026
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I don’t write reviews often, but Core 4x4 absolutely earned this one.
I recently ordered leaf spring mounts and realized after the fact that I messed up my order. Totally my mistake. Instead of giving me the runaround or pointing at a return policy, Core 4x4 emailed me back and forth, worked through exactly what I was doing with my build, and made sure I ended up with the correct parts.
That kind of customer service is rare these days — especially in the off-road world where a lot of companies stop caring once the order is placed.
The parts themselves are exactly what you hope for: solid, well-made, confidence-inspiring hardware that looks like it belongs under a vehicle that actually gets used. You can tell these are designed by people who understand suspension geometry and real-world abuse, not just CAD screenshots.
Mistakes happen — especially on custom or modified builds — and Core 4x4 handled mine like pros. Fast responses, clear communication, and a genuine effort to help me get it right.
If you’re on the fence: don’t be. Core 4x4 is the kind of company you want backing your build — the kind that treats customers like fellow enthusiasts, not order numbers.
MM
Mike Martinez
Aug 25, 2025
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Phenomenal company - very rare to come by in the automotive industry. Also very impressing. Let me start here. I got a set of yellow sway bar end links for my 19 ram DT (new body style) and let me tell you, I’m hooked. For numerous reasons. One the craftsmanship behind the product is unmatched for sure for without breaking the bank. 2ndly, they stand behind their product. Had a very minor issue and it was resolved in a blink of an eye!!! Insane. Just because of what i listed above i will forever spend my money with core 4x4! And i think you should too! I have no affiliation at all with this company besides being a consumer. I will be ordering my yellow UCAs and the rest of my rear suspension from them here shortly!
Korby on the other hand. The representative that helped me went above and beyond FAST. I hung up the phone with him, and with in no lie 3 minutes he was calling back with an answer. GREAT GREAT GREAT customer service, Korby you and core 4x4 are what give us hope in the car community! With much love and great health to you all!!
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Specifications
| Color | Black, Blue, Charcoal, Green, Light Green, Orange, Purple, Red, White, Yellow, Raw Aluminum, Custom Color - Other than what is listed above. Extra charge varies. We will reach out after order is placed. |
| Axle Setup | Full Width Front Axle (Aluminum Lowers), Less than 70" axles (Bent Steel Lowers) |
| Vehicle | Jeep Wrangler JK / JKU (07–18) |
| Brand | CORE 4X4 |
| Note to Core4x4: | - |
| Tags | |
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