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12pc Crawl Series Adjustable Control Arm, Track Bar, Steering Kit

SKU: CRL-J-JK-K12 ★★★★★ (132 reviews)
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$ 2,632.83 2632.83 USD $ 3,097.45

$ 3,097.45

(Save 15%)

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Order today — ships within 1–3 business days
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Order by 3:00 PM MT today — we'll start tomorrow
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Lifetime warranty Fitment guarantee Ships from Orem, UT 4–8 hr install
COLOR 11 colors — pick yours
https://dev.core4x4.com/web/image/product.template/1757/image_1920?unique=edc8f61

12pc Crawl Series Adjustable Control Arm, Track Bar, Steering Kit

SKU: CRL-J-JK-K12
Pick your vehicle to confirm fit
Google 5.0 ★★★★★ (132 reviews)

$ 2,632.83 2632.83 USD $ 3,097.45

$ 3,097.45

(Save 15%)

COLOR 11 colors
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.
Compare all tiers →

Build Your Kit

  • Vehicle
    Confirm this matches your vehicle. Use Shop by Vehicle to filter correctly.
  • Brand
  • Color
    Powder coat color for control arms and track bars. Does not affect performance.
  • Series
    Cruise: daily driving and light off-road. Camp: overlanding. Crawl: aggressive rock crawling.
  • Lift Size
    Choose your current front lift height. Measure from center of wheel to fender if unsure.
  • Hardware
    Choose upgraded hardware if your factory hardware is worn, damaged, or missing.
  • Drag Link Orientation
    Select flipped drag link only if your steering has already been converted to over-the-knuckle.
  • Stabilizer Clamp
    Match your steering stabilizer mounting style. Standard clamp, hydraulic assist, or tie rod clamp.
  • Note to Core4x4:

Select Color to see price and add to cart.

Order today — ships within 1–3 business days
Enter ZIP for arrival estimate change
Order by 3:00 PM MT today — we'll start tomorrow
See full timeline

Alignment recommended Lifetime warranty on all non-wear items Made In USA

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

Maximize Your Jeep Wrangler JK's Suspension and Steering Performance

Upgrade your Jeep Wrangler JK (2007-2018) with the Crawl Series Complete Kit With Steering, designed for Jeep enthusiasts who demand peak performance in all driving conditions. This kit combines exceptional off-road flexibility with smooth on-road handling. Featuring eight adjustable control arms, front and rear track bars, and a heavy-duty 2.5-ton aluminum steering kit, this comprehensive solution ensures unmatched durability, articulation, and control.

Key Features and Benefits

  • Complete suspension and steering overhaul – Achieve precise alignment, axle centering, and superior steering control with eight adjustable control arms, two track bars, and a heavy-duty aluminum steering kit.
  • Extreme durability and strength – Built from DOM tubing with a 5/16” wall thickness, featuring 1.5” OD upper control arms and 1.75” OD lower control arms for maximum durability in extreme terrain.
  • Maximum articulation with Johnny Joints – All control arms and track bars are equipped with RockJock Johnny Joints at both ends, providing superior flexibility and improved ride quality.
  • Optimized adjustability – Fully adjustable to support suspension lifts from 0 to 6 inches, allowing fine-tuned alignment corrections and optimized suspension geometry. Custom solutions for larger lifts are available upon request.

Durable Two-Stage Powder Coating

Each component undergoes a zinc primer base coat for corrosion resistance, followed by a top coat available in 10 colors for a personalized look.

Optional Hardware Upgrade

Designed for straightforward installation using factory hardware, with optional Grade 8 hardware kits available separately for rusted or stubborn bolts.


  • Vehicle Fitment: Jeep Wrangler JK 07-18 – Provides a complete suspension and steering upgrade for improved stability, handling, and control.

  • CORE Advantage: Includes 8 adjustable control arms, front and rear track bars, and a 2.5-ton aluminum steering kit for total suspension and steering precision.

  • Adjustability: Fully adjustable for 0–6” lifts, allowing precise axle re-centering, caster correction, and optimized suspension geometry for any terrain.

  • Construction: Built from heavy-duty DOM tubing with a 5/16” wall and powder-coated for extreme strength, durability, and long-lasting corrosion resistance.

  • 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

Front Lower control arm built with 1.75” OD 5/16” Wall DOM. Welded Johnny Joint on the fixed end and a Forged Johnny Joint on the adjustable end with 1.25” x 12 TPI - 2.625” long threads.

Front Upper control arm built with 1.5” OD 5/16” Wall DOM. Welded u-bracket on the welded end and a Forged Johnny Joints on the adjustable end with 1” x 14” TPI - 2.32” long threads.

Rear Lower control arm built with 1.75” OD 5/16” Wall DOM. Forded Johnny Joints on both adjustable ends with 1.25” x 12 TPI - 2.625” long threads.

Rear Upper control arm built with 1.5” OD 5/16” Wall DOM. Forged Johnny Joints on both adjustable ends with 1” x 14 TPI - 2.32” long threads.

Front Track Bar built with 1.5” OD 5/16” Wall DOM. Welded Johnny Joint on the fixed end and a Forged Johnny Joints on the adjustable end with 1” x 14 TPI - 2.32” long threads.

Rear Track Bar built with 1.5” OD 5/16” Wall DOM. Welded Johnny Joint on the fixed end and a Forged Johnny Joints on the adjustable end with 1” x 14 TPI - 2.32” long threads.

Tie Rod and Drag Link made from 2" 7075 Aluminum. Tie Rod and Drag Link use Apex Chassis Forged Rod Ends.

Make Model Submodel Years
Jeep Wrangler 2007 - 2018

Construction & Materials

Jeep Wrangler JK / JKU 07-18 2pc Crawl Series Front Lower Adjustable Control Arms

Front Lower control arm built with 1.75” OD 5/16” Wall DOM. Welded Johnny Joint on the fixed end and a Forged Johnny Joint on the adjustable end with 1.25” x 12 TPI - 2.625” long threads.

Jeep Wrangler JK / JKU 07-18 2pc Crawl Series Front Upper Adjustable Control Arms

Front Upper control arm built with 1.5” OD 5/16” Wall DOM. Welded u-bracket on the welded end and a Forged Johnny Joints on the adjustable end with 1” x 14” TPI - 2.32” long threads.

Jeep Wrangler JK / JKU 07-18 2pc Crawl Series Rear Lower Adjustable Control Arms

Rear Lowers built with Forged Johnny Joints on the adjustable end and a Welded Johnny Joints on the fixed end with 1.25” x 12 TPI - 2.625” long threads.

Jeep Wrangler JK / JKU 07-18 2pc Crawl Series Rear Upper Adjustable Control Arms

Rear Upper control arms built with 1.75” OD 5/16” Wall DOM. Forged Johnny Joints on both adjustable ends with 1.25” x 12 TPI - 2.625” long threads.

Jeep Wrangler JK / JKU 07-18 2pc Heavy-Duty Tie Rod, Drag Link Steering Kit

Tie Rod and Drag Link made from 2" 7075 Aluminum. Tie Rod and Drag Link use Apex Chassis Forged Rod Ends.

Jeep Wrangler JK / JKU 07-18 Crawl Series Front Heavy-Duty Adjustable Track Bar

Front Track Bar built with 1.5” OD 5/16” Wall DOM. Welded Johnny Joint on the fixed end and a Forged Johnny Joints on the adjustable end with 1” x 14 TPI - 2.32” long threads.

Jeep Wrangler JK / JKU 07-18 Crawl Series Rear Heavy-Duty Adjustable Track Bar

Rear Track Bar built with 1.5” OD 5/16” Wall DOM. Welded Johnny Joint on the fixed end and a Forged Johnny Joints on the adjustable end with 1” x 14 TPI - 2.32” long threads.

Vehicle Jeep Wrangler JK / JKU (07–18)
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.
Series Crawl Series
Lift Size 0" — 6" or 6"+
Hardware No Hardware or Complete Kit
Drag Link Orientation Factory Mounting (under the knuckle) or Drag Link Flip w/ Tapered Sleeve And Drill Bit (over the knuckle)
Stabilizer Clamp Standard Clamp or Hydraulic Assist Clamp
Placement on Vehicle Front Upper, Front Lower, Rear Upper, Rear Lower, Front, 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.

Google

Reviews of Core 4x4

See all on Google
5.0
★ ★ ★ ★ ★
132 reviews
5 ★
97%
4 ★
2%
3 ★
0%
2 ★
1%
1 ★
0%
SG
Sal Giordano Sep 24, 2025
★ ★ ★ ★ ★ Google
I want to take the time to share my experience with Core 4x4. I have a 2004 Jeep Wrangler and was looking to upgrade some suspension parts. I went with Core 4x4 upper & lower adjustable control arms and a front adjustable track bar. Everything arrived quickly, and right out of the box I was impressed with the quality and craftsmanship. I had a few questions during installation (measurements and torque specs), and I spoke with Korby on a couple of occasions. Not only did he send me detailed instructions, but he also shared an installation video specific to the part and vehicle I was working on, something you don’t get from many companies. The control arms fit perfectly, look great, and perform exactly as I hoped. I did run into an issue with the front track bar touching the front diff. When I reached out, Korby had me send pictures and then immediately offered two solutions: his bar guy could make a different bend and send it out to me, or I could get a full refund. His response honestly blew me away. As much as I wanted to run the Core 4x4 track bar, I chose the refund. Korby sent me a prepaid shipping label right away, no hassle. My experience with Core 4x4 has been excellent. Korby was extremely understanding, communicative, and helpful every step of the way. The parts I received were high quality, and the customer service was second to none. I would absolutely recommend Core 4x4 10 out of 10 times and will be using them again. Just a great American company with awesome people who truly care about their customers. Thank you Korby, and thank you Core 4x4!
MV
Mr. V Mar 24, 2021
★ ★ ★ ★ ★ Google
Good quality parts, much stronger than stock
TR
Tim Reigies Mar 25, 2018
★ ★ ★ ★ ★ Google
Received the track bar I ordered, product looks extremely strong, thx core 4x4
JF
jacob fezza Mar 24, 2022
★ ★ ★ ★ ★ Google
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
LM
Logan Matejek May 27, 2025
★ ★ ★ ★ ★ Google
The parts are a massive improvement over factory. I accidentally ordered the wrong endlinks and they helped me figure out the correct size and sent me new ones. Definitely an awesome store
AS
Anthony Snyder Jun 26, 2025
★ ★ ★ ★ ★ Google
Great experience and really great parts
TG
Travis Grimm Mar 23, 2024
★ ★ ★ ★ ★ Google
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.
Review photo 1 Review photo 2 Review photo 3 Review photo 4
DN
Devan Nelson Mar 25, 2019
★ ★ ★ ★ ★ Google
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!
ZA
Zen Asher Mar 23, 2025
★ ★ ★ ★ ★ Google
The quality and durability of the arms are the best. They are super heavy duty. And lifetime warranty is crazy
RR
Ryan Rogers Aug 25, 2025
★ ★ ★ ★ ★ Google
I purchased a set of the Cruiser Series control arms for my Jeep Jk based on postive reviews from different Jeep Facebook pages. Ordered and 2 days later realized they had the very same exact arms on sale in the overstock section. Called them up and they refunded me the savings from my original purchase. Amazing, honest service. Can't wait to get them installed. Keep up the good work guys.

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.
Lift Size 0" — 6", 6"+
Hardware No Hardware, Complete Kit
Drag Link Orientation Factory Mounting (under the knuckle), Drag Link Flip w/ Tapered Sleeve And Drill Bit (over the knuckle)
Stabilizer Clamp Standard Clamp, Hydraulic Assist Clamp
Vehicle Jeep Wrangler JK / JKU (07–18)
Brand CORE 4X4
Series Crawl Series
Note to Core4x4: -
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Frame Brackets Coming Soon Mounting + relocation brackets › Panhard Mount Coming Soon Track bar relocation mount › Axle Truss Weld-on axle reinforcement 2 › Rear Bumpers Heavy-duty rear bumpers 1 › Frame Stiffener Coming Soon Frame reinforcement plates for big lifts › Skid Plates Coming Soon Engine · Oil pan · Muffler · Gas tank › Exterior Accessories Bumper guards · Cargo racks · Light mounts 8 › Armor Axle trusses · Diff covers · Crossmembers 22 ›
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Drivetrain Coming Soon Axles · Gearing · Driveshafts ›