Over the past 10+ years of building and breaking 4Runners, we have all 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 Opt Offroad decided to build their own set of arms, using thick and beefy DOM 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 balance 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.
Double-adjustable 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 easier tire clearance (if you have 35in+ tires then this applies to you).
- Superior to other "single-adjustable” arms: 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.
Johnny Joints® throughout: (valued at $66 each, or $528 for a full set!)
- Custom machined for our trucks specifically, for 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).
- Sealed, greasable flex joints with ultra-low maintenance and none of the clanking, moaning, or squeaking of polyurethane, heims, and other flex joints. (our V1 prototypes have never been greased or serviced, for testing purposes. Spoiler alert, they're still flawless and silent). 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).
Pricing:
- Pair of Upper Control Arms: $359
- Pair of Lower Control Arms: $459
- Full Kit, Uppers and Lowers: $789 ($29 bundle discount)
Timeline: In stock, ready to ship!
Install Help: Watch Timmy the Toolman’s Install Video HERE
FAQs:
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?
Adjustable panhard bars are proven to be less effective than a Panhard Correction Kit, and more expensive at that! We prefer to let people save money where they can, so for now we are not offering adjustable panhard bars. We recommend installing a PCK to solve both the axle recentering issue AND the geometry issue. 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..."
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 standard joint (for cushioning). The standard 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 and Upper 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.