SKU: 41821867427

Rear Adjustable Control Arms (03-24 4Runner, FJ, GX)

Sale price$418.05 Regular price$464.50
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Ships within 48 hours · Estimated delivery Aug 13 - Aug 18

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Description

Rear Adjustable Control Arms (03-24 4Runner, FJ, GX)IN STOCK READY TO SHIP. Performance + durability of a race part. Manners + longevity of a stock part. The best of both worlds. Over the past 10+ years of building and breaking 4Runners, we have experienced a lot of different rear arm kits. There were lots of options on the market, but there just wasn't anything that checked off all the boxes. So we decided to build our own set of arms, using overkill steel tube, top quality machining, and the

IN STOCK READY TO SHIP.

Performance + durability of a race part.
Manners + longevity of a stock part.
The best of both worlds.

Over the past 10+ years of building and breaking 4Runners, we have experienced a lot of different rear arm kits. There were lots of options on the market, but there just wasn't anything that checked off all the boxes. So we decided to build our own set of arms, using overkill steel tube, top quality machining, and the industry's gold-standard Johnny Joints®.

Description:

Thick-walled DOM steel:

  • No more breaking and bending rear arms! 1.625in tube lowers, 1in tube uppers for the best compromise between strength and clearance throughout travel.
  • Wrench flats for easy adjustment and torquing of the lock nuts.
  • Powdercoated textured black with etched-in Opt logo.

Adjustable, offset design:

  • Correct your pinion angle to prevent premature u-joint wear and vibrations (if you have a lift then this applies to you).
  • Move rear axle position for better tire clearance.
  • Upper- Double adjustable design, for easy fine tuning after install. No need to uninstall anything to adjust the length. Simply loosen the jam nuts, dial in your lengths, and then tighten the jam nuts back down. Double-adjustable arms also have twice the adjustability length (3in) versus single-adjustable arms.
  • Lower- Offset joint on one end for better clearance of the oversized joint throughout travel. Lifted trucks tend to have clearance issues at full droop due to the very tight design of the factory axle mounts.

Johnny Joints® throughout: (valued at $66 each, or $528 for a full set!)

  • Sealed, greasable flex joints with ultra-low maintenance and none of the clanking or squeaking of other flex joints and heims. (our V1 prototypes were used for 5+ years and were never greased or serviced, for testing purposes.) They're serviceable and easily rebuildable, so it's money saved in the long run.
  • More articulation than stock, polyurethane, heims, and other flex joints. Johnny Joints have an impressive 34-42 degrees of articulation depending on the joint (other brands claim up to 33).
  • Custom machined for our Toyota trucks (perfect fitment with stock mounts and hardware). To our knowledge, these are the first and only set of rear uppers and lowers that utilize nothing but Johnny Joints! If you aren't familiar with their reputation, click here (short version: they're the best).

Pricing:

  • Upper Control Arms: $399
  • Lower Control Arms: $559
  • Full Kit, Uppers & Lowers: $929 ($29 bundle discount)

Timeline: In stock ready to ship!

Install Help: Watch Timmy the Toolman’s Install Video HERE (this video was for the 3rd Gen 4Runner kit, but the majority of it all still applies).

FAQs:

Without a poly/rubber bushing at one end, shouldn't I worry about damage to my truck's lower link mounts?

No! We designed the lower arms to include one narrow joint (for articulation) and one wide joint (for cushioning). The 'wide' model JJs have as much built-in cushion as a conventional poly bushing, due to the 2-piece construction of their proprietary urethane bushings. Regardless of your setup, we recommend installing a Lower Link Reinforcement kit on any trail rig, as the potential for mount damage increases the more you upgrade the truck and push the limits.

What should I use to grease the joints?

Any standard Moly Grease will do just fine, but Rock Jock 4x4 has a proprietary Moly Grease that is available in our Rebuild Kit menu.

Is hardware included?

No, we had these Johnny Joints custom built so they are specifically sized for our factory bolts! This helps keep your cost lower and makes installation easier.

 Why no adjustable panhard bar?

First and foremost, we recommend a Panhard Correction Kit before upgrading your panhard bar. Adjustable bars are proven to be less effective than a PCK, and more expensive at that. The PCK will solve both the axle recentering issue AND the geometry issue, unlike an adjustable bar by itself. Per eimkeith: "The Panhard Correction Kit returns the panhard bar to horizontal (per original design), eliminates the need for an aftermarket adjustable panhard bar to recenter the axle, and in most cases (up to 4 inches of lift) raises the roll center for improved handling..."

If you are in need of an adjustable panhard bar, check out the Double Adjustable Panhard Bar from KDK Fab.

Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 41821867427

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COLLEEN
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★★★★★ 5
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I WAS IMPRESSED, THESE ARE NOT SEE THROUGH THIN SHEETS, THEY HAVE SOME SUSTAINS TO THEM. THEY WASHED WELL AND ARE NOT ALL WRINKLED, THEY ARE SOFT AND THE COLOR WAS EXACT FROM THE PIC.
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Reviewed in the United States on May 27, 2026
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It's all me
Battle Creek, US
★★★★★ 5
Amazing for the low price!
Color: Grey, Size: Queen
We bought a newer camper that the previous owners put a regular, deep pocket mattress. After trying to fit our regular ones on and popping right off, I went right to Amazon and searched "deep pocket queen sheets". The first one came up with a very low price, I ordered them. They came in in about a day and a half. They were a great color, perfect fit and so soft. Something I would've paid so much more for! They are fabulous!!!
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Reviewed in the United States on May 26, 2026
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La Bella Vita Finds
Phoenix, US
★★★★★ 5
Noiseless, Cool & High Quality—Amazing Value!
Color: 2 White, Size: King
I’m extremely impressed with this mattress protector! First, it truly lives up to being noiseless—there’s no crinkling or plastic sound at all, which makes a huge difference for a comfortable night’s sleep. It also doesn’t trap heat, so the bed stays cool and breathable throughout the night, which I really appreciate. The quality is excellent—you can feel it as soon as you open the package. It’s well-made, soft, and fits perfectly thanks to the deep pockets, staying securely in place without shifting. The waterproof feature gives great peace of mind without sacrificing comfort. On top of all that, it came very well packaged and feels like a premium product at a very affordable price. Honestly, it exceeded my expectations. I would definitely recommend it for anyone looking for a high-quality, comfortable, and reliable mattress protector.
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Reviewed in the United States on April 16, 2026
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HandyAndy
Grantham, US
★★★★★ 5
Nice protector cover, quiet and comfy - best for THICK mattresses
Color: 3 Navy Blue, Size: Full
I liked this pad immediately as fabric cover has nice quilting (just slightly puffy), and touch feel and feels substantial enough to hold up over time. I’ve ordered a few different brands of these and they were crappy, insubstantial pads I did not think would hold up to more than a couple washings. My biggest complaint and it’s due to my own lack of experience buying these in the new world of skillions of mattress thickness choices is that (A) the side panels / elastic pockets are HUGE and will never be secure on anything thinner than a 12” (or thicker!) mattress; and (B) I thought I was buying an ENCASEMENT cover pad which this is not. I’m blaming that on Amazon because I specifically input “encasement” in the search and their F’ing search algorithm does whatever the heck it wants and if you’re not paying nit-picky attention you get stuff you don’t want. (Or you waste time sorting out the ones you didn’t want to see in the first place!) That said I am seriously considering keeping this (depending on late arrivals of competing covers) as I’m certain this will be comfortable and as quiet as these waterproof covers get. It’s a nice cover. UPDATE: it’s a couple weeks later and I’m reporting I did keep it and am happy to have done so. It installed more securely than anticipated and is as comfortable as I thought it would be. I’ll try and update again when I have time to resize pics and show how much my cat enjoys it too:) UPDATE#2: in review I noticed that the 1* reviews were on about nasty liquids leaking through - I haven’t had any large scale events to gauge but I can see how those reviews could be valid. I should report out of EVERY type of these “nice” noiseless “waterproof” pads I’ve got I think every one of them probably could have the same fault. In other words though I use and really like this cover I also purposely use an encasement style mattress protector (you know the put it in a bag w/zipper kind and a pain in the a** to do so kind) to avoid the complaints in the 1* camp. These mattresses are just too costly and spongelike to NOT protect them completely so I appreciate their frustration that things leaked for them. In my choice to keep this I did so because a) it most probably is pretty waterproof & is definitely quiet & comfy; b) it’s pretty easily washable; and c) because most of the encasement protectors are of more “crinkly” material than this (at least the ones I’ve seen so far - maybe the super expensive ones have figured out how to be perfectly waterproof without crinkle) and by using this nice top protector I put a layer on top of the crinklier encasement and everything just ends up much better with no noticeable crinkle. Figured I say this to help detail 1* vs. 5* because right!? how can one thing be so great and when you turn around then be so terrible… just sayin. (& I did not change my 5* rating😎)
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Reviewed in the United States on March 16, 2026
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Thomas W.
Dallas, US
★★★★★ 5
⭐⭐⭐⭐⭐ Excellent Protection and Comfort — A Mattress Protector That Really Works!
Color: 3 Navy Blue, Size: Full
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