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SKU: J-JK-C-BSK

Full Bump Stop Extension Kit

Jeep Wrangler JK / JKU 07-18 Full Bump Stop Extension Kit
$110.84 $125.95 Save $15

$ 110.84 110.84 USD $ 125.95

$ 125.95

Save $ 15.11

Built to order, usually ships in 1–3 days.
Enter ZIP for arrival estimate Delivery date by ZIP
Order by 3:00 PM MT today — we'll start tomorrow
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COLOR Pick yours
100% bolt-on, no welding Made in USA · Orem, Utah You break it, we replace it Joints you rebuild instead of replace
Talk to an Expert: 385-375-2104 ADD TO CART →
https://jerdev.core4x4.com/web/image/product.template/2176/image_1920?unique=95d2d87

Full Bump Stop Extension Kit

Jeep Wrangler JK / JKU 07-18 Full Bump Stop Extension Kit
SKU: J-JK-C-BSK
Does not fit your Toyota FJ Cruiser Shop parts that fit ›

COLOR Pick yours

Build Your Kit

  • Vehicle
  • Brand
  • Color
  • Bump Stops
  • Front Bump Stop Extensions
  • Rear Bump Stop Extensions
  • Note to Core4x4:

$ 110.84 110.84 USD $ 125.95

$ 125.95

Save $ 15.11

Select Color to see price and add to cart.

100% bolt-on, no welding Made in USA · Orem, Utah You break it, we replace it Joints you rebuild instead of replace
Talk to an Expert: 385-375-2104
Built to order, usually ships in 1–3 days.
Enter ZIP for arrival estimate Delivery date by ZIP
Order by 3:00 PM MT today — we'll start tomorrow
See full timeline
Core 4x4 Manufactured Social 15 Promo Eligible

Alignment recommended You break it, we replace it. Made In USA

Made in USA Orem, Utah
You break it, we replace it Warranty on non-wear items
10 Colors In-house powder coat
Fully Adjustable 0-6" of lift
3 X-Series Options Only Core 4x4

Product Details

Make Model Submodel Years
Jeep Wrangler 2007–2018

  • Vehicle Fitment: Jeep Wrangler JK/JKU 07-18 – Protects against over-compression damage, preventing tire contact, frame stress, and component damage when lifting or increasing suspension flex.

  • CORE Advantage: Corrects bump stop engagement to prevent costly damage from over-compression. Ensures optimal suspension travel, keeping components safe and maintaining suspension integrity on rough terrain.

  • Multiple Sizes Available: Designed for easy integration with various suspension setups, these extensions provide precise bump stop engagement for lifts of all sizes, preventing overextension and ensuring smooth suspension cycling.

  • Construction: Front extensions crafted from high-strength 6061 T6 aluminum for corrosion resistance and lightweight durability. Rear extensions made from heavy-duty 3/16” steel for maximum strength in demanding conditions.

  • 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. You break it, we replace it.

Built With

Front Bump Stops machined from 2.5” 7075 Aluminum. Rear Bump Stops laser cut from 4” x 3” Rectangle 3/16” Wall Tube.

Construction & Materials

Jeep Wrangler JK / JKU 07-18 Front Bump Stop

Front Bump Stops machined from 2.5” 7075 Aluminum.

Jeep Wrangler JK / JKU 07-18 Rear Bump Stop

Rear Bump Stops laser cut from 4” x 3” Rectangle 3/16” Wall Tube.

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 Custom Color - Other than what is listed above. Extra charge varies. We will reach out after order is placed.
Bump Stops None or New Bump Stop Rubber Pads (Available For Front Only - Not Pictured)
Front Bump Stop Extensions 2" or 3" or 4"
Rear Bump Stop Extensions 3" or 4"
Placement on Vehicle Rear
Mounting Style Bolt-On

Essential Protection for Your Lifted Jeep

Upgrading your 2007-2018 Jeep Wrangler JK/JKU with increased suspension flex and lift? Ensure your rig is protected from over-compression damage with CORE 4X4 Full Bump Stop Extensions (J-JK-C-BSK). Factory bump stops become inadequate as lift height increases, which can lead to tire-to-fender contact, frame stress, and component damage. These extensions correct bump stop engagement, preventing costly issues while maintaining optimal suspension travel.

Key Features and Benefits

  • Prevents Over-compression Protects Components – Properly limits suspension travel to prevent tire contact, fender damage, and excessive stress on suspension components.
  • Premium Construction for Maximum Durability – Front extensions crafted from lightweight, high-strength 6061 T6 Aluminum for corrosion resistance and longevity. Rear extensions made from heavy-duty 3/16” steel, ensuring maximum strength in extreme conditions.
  • Offset Design for Improved Alignment – Unlike traditional puck-style extensions, our offset design maintains correct bump stop alignment, ensuring even load distribution and reducing stress on the mounts.
  • Straightforward Installation – Rear installation is simple bolt-on, utilizing existing bump stop mounts. Front installation requires removing coil springs and factory rubber bump stops, then bolting the extensions in place before reinstalling.

Precision Fit for Any Suspension Setup

Our bump stop extensions come in a range of sizes to accommodate various lift heights and suspension setups, ensuring proper suspension function without sacrificing performance.

Two-Stage Powder Coating for Maximum Durability

Every component undergoes a zinc primer base coat for corrosion resistance, followed by a top coat available in 10 colors, allowing you to customize your Jeep while protecting against rust and wear.

Proudly Made in the USA

Manufactured at our Orem, UT facility, we maintain strict quality control and support local suppliers, ensuring rugged durability and premium craftsmanship.


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, and any add-on options, then add to cart — you’ll confirm your lift height at checkout. 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.

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5.0
★ ★ ★ ★ ★
132 reviews
5 ★
97%
4 ★
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David Rogers Aug 25, 2025
★ ★ ★ ★ ★ Google
Ive had the front adjustable control arm kit in bright green for my 1996 ZJ. Ive had the kit for about a year now and i have to say, im extremely impressed, over 1000 miles off-road and roughly 20,000 miles on the highway. These control arm kits for any vehicle built by core 4x4 are well worth the money, just be aware thereight be some minor scatches or chips from shipping ( but who should care about that if you're beating the crap out of em' they way they were built and designed for)
Review photo 1 Review photo 2
MG
Morgan Griffith Mar 25, 2018
★ ★ ★ ★ ★ Google
I met a couple of the Core 4x4 guys at the Salt Lake Offroad Expo and decided to try them out after noticing one of my control arm bushings was disintegrated. I called to discuss parts on Thursday and I was leaving for a trip on Saturday. These guys built my control arms and had them ready to be picked up Friday, 24 hours later. The parts seem to be great quality and they charged me nothing extra to have them painted. These guys were extremely helpful and without them my trip probably would have been cancelled. looking forward to testing out the arms on my next trip to Moab.
CL
Colten Lockwood Mar 25, 2019
★ ★ ★ ★ ★ Google
Recieved warrenty exchanges for my control arms last night couldnt be happier!!! Lets talk about the arms tho! Great quality arms in multiple styles and colors!!! I purchased the teir 3 short arns for my 98 xj. I can say that they setoff nicely so my 35 inch tires do not rub! As long as you can get a photo or video of broken hardware core will take care of you. The body of the arm is bulletproof. However make sure to maintain and grease the joints regularly as with any greaseable joint and they shouldkast forever. I had a few problems arise a year after purchase and after some troubleshooting spence was able to help get me the correct parts to get back on the road. I recommend this setup to any and all jeepers looking to get away from the stock arm setup. Alltogether i am Very happy with the performace of my control arms!!!! Mechanic and bodyman of 12 years and my first choice for quality control arms!!
VK
Victor Keele Sep 24, 2025
★ ★ ★ ★ ★ Google
Great customer service. I got my front upper and lower control arms and hardware on Friday afternoon. It didn’t come with instructions so I called Core 4X4 and they immediately e mailed me the instructions. Also, the kit I got had the spacers missing so I called. It was late Friday by thus time but they took care of the issue first thing Monday morning and I got the spacers on Tuesday. Great company.
Review photo 1 Review photo 2
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Jason Jukich Jul 26, 2025
★ ★ ★ ★ ★ Google
Fast shipping, excellent communication, and awesome products
BB
Brayden Brockey Mar 23, 2024
★ ★ ★ ★ ★ Google
Got a set of upper control arms for my xj, really impressed with the quality
Review photo 1
EA
Eric Ahonen Mar 24, 2021
★ ★ ★ ★ ★ Google
Awesome control arms! My mechanic said “ your Jeep is pretty much bulletproof now.” And I just got the tier 1 arms! The people at the core 4x4 shop were really nice too. They were running behind on shipping, (which is understandable) so I decided to go pick it up because it was only an hour drive. They gave me a free $60 hardware kit for the inconvenience. Thanks core 4x4! You guys are awesome!!
EG
Erica Grissom May 27, 2025
★ ★ ★ ★ ★ Google
First off, I wish I knew about them sooner. The customer service is top tier. The response time is about 30 min no waiting 1-3 days to get a response. The parts are heavy-duty and look amazing. The packaging is perfect, I can't wait to hit some trails. Thanks Core4x4
GK
GLENN KOSZKA Apr 27, 2025
★ ★ ★ ★ ★ Google
The folks at Core 4X4 are always wonderful to deal with. They explain your options and never pressure or rush things. The quality of the Core Control Arms is top shelf, especially if your goal is to stop wheel hop. I recommend Core 4x4 without reservation ! ! !
SH
Shawn Hooten Apr 27, 2025
★ ★ ★ ★ ★ Google
Great products, shipped the next day during a big sale event. Core 4x4 gets it right and gets it done! Thank you all.
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Made in Orem, UT · You break it, we replace it.
385-375-2104
Toyota FJ Cruiser
2007–2014
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