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 custom, small hex 3/4 in.-16 left hand thread jam nut that is included in our CE-9112BL threaded bung kit.
| Brand | RockJock |
Reviews of Core 4x4
5.0
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132 reviews
SC
Singer Heating and Cooling
Mar 25, 2018
★
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These guys are great. You can get them on the phone for support. This important and is not always the case with other custom parts builders. Their control arms are bomb proof and offer plenty of options. You can get real genuine Currie Johnny joints without paying the price for Currie arms.
OJ
Oldgreg jr
Mar 23, 2025
★
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Good company, they offer well built parts and Great customer service.
I had a couple of hang ups with my control arms that I purchased, they were very easy to work with and found the solution to make them work.
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
NM
Noah Myers
Mar 23, 2024
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I contacted these guys on a Saturday through email and needed some control arms by the following weekend, Spence got back with me and told me he would make sure the order got shipped out on Monday, they got busy and wasn’t able to ship the package out so he got back with me that evening and upgraded my shipping for free and shipped out the next day, only because he told me he’d make sure I’d have them by the weekend! This company sticks to their word! The customer service from these guys are unmatched and they will have another lifetime customer here!
TD
Tim Davis
Sep 24, 2025
★
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Customer service is amazing, responds fast and know what they are talking about. Their product looks top of the line.
AL
Aaron Lake
Apr 27, 2025
★
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Korby was a great help with getting me a set of leaf springs for my Cherokee. Great customer service and an awesome product all made in the USA. Proud to support and rock their parts on my vehicle. 👍 …
RM
R2d2 Movi78
Feb 21, 2026
★
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I’m extremely impressed with Core 4x4. The quality of their parts is outstanding — everything feels solid, well‑built, and engineered with real attention to detail. Shipping was fast and everything arrived perfectly packaged. Their customer service is just as good as their products: responsive, helpful, and genuinely committed to making sure you get exactly what you need.
Overall, a top‑tier experience. I’ll definitely be buying from them again. Specially thank you Mr. Linscomb from Core 4x4. Arturo M.
JL
John Luna
Nov 23, 2025
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Great team, and help to support my jeep and provide best stuffs
JJ
Jason Jukich
Jul 26, 2025
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Fast shipping, excellent communication, and awesome products
JM
Jason Mitchell
Dec 8, 2025
★
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Installed the full kit on my XJ. Ride quality is night and day better than what I had before. The articulation on the trail is insane. These guys know what they are doing. Already recommended Core 4x4 to everyone in my club.
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Specifications
| Brand | RockJock |
