2021-2026 Ford F-150 Raptor Billet Rear Lower Trailing Arms - Uniball Version

• 2 FMI billet aluminum rear lower trailing arms, with spacers and hardware
• 1" FK uniballs
• Custom-machined 17-4 stainless steel spacers sized for the stock mount locations
• Urethane wobble stoppers on the front mounts to hold the arms in alignment

The factory suspension travel sensor mounts to the upper arm, not the lower, so nothing on this kit interacts with the truck's ride height sensing. If you are replacing the uppers as well, that post is built into the billet upper arms.

The Gen 3 Raptor runs a five-link rear axle. The lower links take the fore-and-aft load — everything the engine puts down and everything the brakes take back goes through them. The uppers control axle wrap and pinion angle, and the panhard bar handles side to side.

The factory lower arm is stamped sheet metal, folded into shape and welded at the seams, with a rubber bushing at each end. Rubber is chosen for isolation, not location. Put real load through it and it compresses, the axle moves relative to where the chassis thinks it is, and the rear end feels disconnected under power — the same compliance that turns into wheel hop on a hard launch.

A machined billet arm is one piece with no seams and material placed where the load actually is, and the uniball gives it a defined pivot instead of a squishy one.

We build the Gen 3 billet rear arms two ways. Both are billet aluminum, both bolt into the factory mounts, both give the same 15 inches of rear wheel travel. The joint is the only difference.

Uniball — this kit. A 1" FK uniball at the pivot: tighter and more direct than an elastomeric joint, and the uniball itself is a replaceable wear item rather than something that scraps the arm. FK is the industry benchmark and these arms have been on Raptors for years.

Ultra-Flex — our patent-pending joint. Greaseable on the truck through an external zerk, quieter as it wears, rebuildable with a urethane body, and better in wet or salted conditions. See the Ultra-Flex rear lower arms.

Fits the Gen 3 and Gen 3.5 Ford F-150 Raptor, model years 2021, 2022, 2023, 2024, 2025 and 2026, including the Raptor R.

Stock-length only — this is not a long travel kit and it does not change rear geometry.

Bolt-on, into the factory mount locations, with the spacers machined to suit. No cutting, no welding, no fabrication and no alignment required afterwards.

Support the truck safely and take the load off the rear axle before removing the factory arms. Guides are at Install Instructions, and we do in-house installation in Mesa.

Three options: raw billet aluminum, black anodized and FOX orange anodized.

Raw is a finish choice, not a lesser part — plenty of builds run raw billet deliberately for the machined-aluminum look. Anodized parts should be cared for as anodized aluminum; see the care notes before you take a pressure washer or a harsh wheel cleaner to them.

Do these fit a 2025 or 2026 Raptor?

Yes. They fit 2021 through 2026 Gen 3 and Gen 3.5 trucks, Raptor R included.

Is this the lowers only, or the full set?

Lowers only, sold as a pair. The upper arms are listed separately, or take both together as the complete billet rear arm kit.

Lowers or uppers first?

Lowers. They carry acceleration and braking load, so they are the pair you feel most. The panhard bar comes before either — it is the least expensive part of the rear suspension and makes the biggest immediate difference.

Will these stop wheel hop?

They address its main cause. Wheel hop comes from the rear suspension deflecting and rebounding under load, and rubber bushings in the lower links are where most of that deflection lives.

Does this affect the factory ride height sensor?

No. The travel sensor mounts to the upper arm, not the lower, so the lowers do not touch it.

Is the uniball serviceable?

Yes. It is a wear item by design and presses out for replacement, so the arm stays on the truck for life. Replacement uniballs are under Serviceable Parts.

What are the wobble stoppers for?

The urethane wobble stoppers sit at the front mounts and keep the arms from rotating out of alignment in the bracket. They are urethane, not Delrin.

Where are they made?

Designed, machined and finished in-house at our facility in Mesa, Arizona, USA.

• Billet panhard bar — the one we would buy first
• Billet rear upper trailing arms — uniball, to complete the set
• Rear bump stop kit and rear limit strap kit

Side by side on Gen 3 Rear Links & Panhard Bar, or the full catalog on Gen 3 Raptor Rear Suspension.