Why a lift pushes the rear axle off center, how an adjustable panhard bar (track bar) puts it back, heim joint vs. Johnny Joint vs. billet, and which bar fits your Raptor, Bronco, Bronco Raptor, TRX or RHO.
The Short Answer
A panhard bar, also called a track bar, is the one bar that holds the rear axle centered side to side under the truck. It swings through an arc, so any change in rear ride height moves the axle sideways at the same time it moves up or down. Add spring spacers, taller springs or a rear lift and the axle ends up off center. An adjustable panhard bar threads to length so you can put the axle back where it belongs. At stock ride height you do not need adjustment, and a fixed-length billet bar is the simpler upgrade. On a long travel build with relocated mounts, you need the longer bar built for that geometry.
What a Panhard Bar Does
The Gen 3 Raptor, Bronco, Bronco Raptor, TRX and RHO all run a solid rear axle on links. The trailing arms locate the axle fore and aft. The panhard bar is the only part locating it side to side, so everything the rear end does laterally goes through that one bar. Panhard bar, track bar and lateral link are all names for the same part.
The factory bar carries that load through rubber bushings. Rubber is there to keep noise out of the cab, and it does that well. What it does not do is hold a position. Load the rear end in a corner or land the truck and the bushings compress, the axle steps sideways, and the truck feels like it is steering from the back. A chromoly or billet bar on real joints removes that give, and the rear of the truck stops moving underneath you.
Why a Lift Pushes the Axle Sideways
The bar runs at an angle from the frame on one side to the axle on the other. Because it pivots at both ends, it moves through an arc, not straight up and down. Raise the rear and that angle changes, which pulls the axle across. A fixed-length bar cannot correct for that. An adjustable bar lengthens or shortens until the axle is centered again.
Do You Need an Adjustable Panhard Bar?
This matters more than which joint you pick. Three different trucks need three different bars.
Stock Ride Height
The axle is already centered, so you only need the rubber gone. A fixed-length billet panhard bar with Ultra-Flex joints is the right answer and the simplest install.
Lifted or New Rear Springs
Spring spacers, taller springs or any rear lift changes ride height and moves the axle off center. You need an adjustable panhard bar, in heim joint or Johnny Joint.
Long Travel Rear (Gen 3 Raptor)
Long travel moves the panhard mounting points. It takes the 41.5" adjustable bar and the long travel frame and axle mounts it is built for.
Front Leveling Only
A leveling kit that only raises the front does not change rear ride height, so it does not move the rear axle. If you also change the rear, go adjustable.
Heim Joint vs. Johnny Joint vs. Billet Ultra-Flex
The adjustable bars come two ways: same 1.5" chromoly tube, MIG welded and powder coated texture black, same length adjustment. The joint is the only difference, and it is a real one. The billet bar is the fixed-length option for stock ride height.
| What you care about | Adjustable, heim joint | Adjustable, Johnny Joint | Billet, Ultra-Flex |
|---|---|---|---|
| Length | Adjustable | Adjustable | Fixed, stock length |
| Joints | FK 1" rod end and FK 1" uniball | Forged 1" Johnny Joint with urethane liner | 17-4 stainless ball in a urethane body |
| Axle location | Most precise, metal on metal | Precise, liner takes the edge off | Precise at stock height |
| Noise in the cab | You hear more of the axle | Quieter | Quiet |
| Service | Rod end and uniball are replaceable | Serviceable joint | Grease zerk; rebuild with a new urethane body |
| Best for | Race-minded builds | Lifted trucks that see a lot of pavement | Stock-height trucks |
Want the full story on our patent-pending joint? Read Ultra-Flex Joints: The Best Choice for Billet Rear Links & Panhard Bars.
How to Set Panhard Bar Length
Set It at Ride Height
Adjust with the truck at its finished ride height, on the ground and settled, not hanging on a lift. Measuring at full droop will send the axle the wrong way.
Measure Both Sides
Measure from a fixed point on the frame to the same point on each side of the axle. Lengthen or shorten the bar until both sides match.
Lock It Down
Tighten the jam nut against the rod end. Recheck the tire-to-fender gap from behind the truck.
Do Bump Stops and Limit Straps While You Are There
If you are changing rear ride height, the rear end is already apart. It is a good time to add rear bump stops and limit straps so the new travel is controlled at both ends.
Panhard Bar Kits by Truck
| Truck | Adjustable, heim joint | Adjustable, Johnny Joint | Billet, fixed length |
|---|---|---|---|
| Ford F-150 Raptor, 2021–2026, Raptor R included | Gen 3 heim bar | Gen 3 Johnny Joint bar | Gen 3 billet bar |
| Gen 3 Raptor long travel rear | 41.5" long travel bar | — | — |
| Ford Bronco, 2021+ | Bronco heim bar | Bronco Johnny Joint bar | Bronco billet bar |
| Ford Bronco Raptor, 2022+ | Bronco Raptor heim bar | Bronco Raptor Johnny Joint bar | Bronco Raptor billet bar |
| Ram TRX, 2021–2024 | TRX heim bar | TRX Johnny Joint bar | — |
| Ram TRX, 2027 | 2027 TRX heim bar | 2027 TRX Johnny Joint bar | — |
| Ram 1500 RHO, 2025+ | RHO heim bar | RHO Johnny Joint bar | — |
TRX generations do not cross over. The 2021–2024 TRX and the 2027 TRX each use their own bar. Bronco billet bar: it may not work with aftermarket rear axle covers. Everything for the Gen 3 rear end is side by side on Gen 3 Raptor Rear Links & Panhard Bar.
Panhard Bars Installed
1.5" chromoly adjustable bars and machined billet fixed-length bars, built in Mesa, Arizona.
Converting to a 5-Link Rear?
A Gen 1 or Gen 2 Raptor or a standard F-150 rides on leaf springs, so it has no panhard bar. Convert it to Gen 3 5-link suspension and it needs one, along with the frame and axle mounts it bolts to. See How To Convert Your Ford F-150 or Gen 2 Raptor to Gen 3 Suspension and Gen 1 to Gen 3: Convert Your Ford Raptor to 5-Link Suspension.
Panhard Bar FAQ
Is a panhard bar the same as a track bar?
Yes. Panhard bar, track bar and lateral link all describe the same part: the single bar that holds the rear axle centered side to side under the truck.
Do I need an adjustable panhard bar after a lift?
Yes, if the rear ride height changed. Raising the rear swings the axle sideways because the bar travels through an arc. An adjustable bar is what re-centers it. Even a spring spacer is enough to move it.
Can I run a fixed-length bar on a lifted truck?
Not ideally. A fixed-length bar holds the axle wherever the new ride height puts it, which is off center. Go adjustable.
Heim joint or Johnny Joint?
The heim joint bar locates the axle most precisely, but you will hear more of what the rear axle is doing. The Johnny Joint has a urethane liner, so it is quieter and the better pick for a truck that sees a lot of pavement.
Does an adjustable panhard bar need welding?
No. The bars ship fully welded and powder coated from our shop and bolt to the factory panhard bar mounts. The exception is a long travel rear, where the relocated frame and axle mounts weld on.
Do I need an alignment after installing a panhard bar?
No alignment is required for a straight swap at stock ride height. If you changed rear ride height, set the bar length so the axle is centered and have it checked.
Why buy the panhard bar before the rear links?
It is the single part holding the axle centered, it is the least expensive piece of the rear suspension, and it makes the biggest immediate difference in how planted the truck feels. On a Gen 3 Raptor, do the lower trailing arms next, then the uppers.
Does the Gen 3 bar fit a 2025 or 2026 Raptor or a Raptor R?
Yes. The Gen 3 bars fit 2021 through 2026 trucks, Raptor R included.
Where are FMI panhard bars made?
In-house at our shop in Mesa, Arizona.
Not sure which bar your truck needs? Call the shop and tell us what you are running for springs, lift and travel.