Bump Stops & Hydraulic Bump Stop Kits

For the full explanation, read What Is a Bump Stop? Hydraulic Bump Stops Explained.

A bump stop is the part that stops your suspension at full compression, so the axle or control arm hits it instead of the frame. A hydraulic bump stop is a short, oil-filled shock that the suspension contacts in the last few inches of travel. It builds resistance as it compresses and slows the suspension down, so a big hit turns into a squeeze.

Without one, a full-compression hit goes straight into the shock mounts, the frame and the link or arm mounts. Repeat it enough times and that is how mounts end up cracked. The more wheel travel a truck has, the more the bump stop matters.

The rear is where most owners start. The Raptor, Bronco, Bronco Raptor and Ranger Raptor rear kits bolt on. The Ram TRX and RHO cans install in the factory rear spring buckets with minimal modifications, and the TRX and RHO cans stack with rear spring spacer plates for rear lift.

• Replaces the factory rear bump stop: Ram TRX, Ram RHO, Bronco Raptor and Ranger Raptor.
• Adds a hydraulic bump stop: F-150 Raptor, where the stock rear bump stop can stay but is not necessary, and the Bronco, which has no factory rear bump stop.

The Gen 1, Gen 2 and Gen 3 Raptor rear kits all work with long travel rear suspension.

At the front, the bump stop is built into a limit strap and bump stop kit for the factory lower control arm. The limit strap stops top-out before the shock does, and the bump stop handles full compression.

The lower bracket bolts to the factory lower arm. The bump stop mount welds to the frame, so have a qualified welder or fabricator install it.

Running FMI fabricated lower control arms? Those arms have a bump pad built in, and a matching weld-on front bump stop can mounts to the frame. Kits are available for the Gen 1, Gen 2 and Gen 3 Raptor and the 2021–2024 and 2027 Ram TRX.

• 2.5" kits: Raptor, TRX, RHO and Bronco Raptor kits take a 2.5" diameter bump stop with 2.5" of travel. Fox, King and ADS 2.5" bump stops fit, and some kits also list Carbon.
• 2.0" kits: Standard Bronco and Ranger Raptor kits, front and rear, take a 2.0" OD adjustable bump stop with a threaded body. Bronco kits and the Ranger Raptor front kit use 2.0" of travel.

Most kits let you pick the bump stop brand at checkout, or order the mounts only if you already have bump stops. We also stock the bump stops on their own: FOX 2.0 and FOX Factory Race 2.5 x 2.5, ADS race threaded 2.125 x 2 and 2.5 x 2.5, King 2.5 x 2.5, and Carbon 2.1" threaded and 2.5" hydraulic pin top.

What does a hydraulic bump stop do?

It controls the last part of the suspension travel. Instead of slamming into a hard stop, the suspension compresses a short oil-filled shock that builds resistance, which softens big hits and protects the shock mounts, frame and link or arm mounts.

Do I need bump stops on a stock truck?

If you drive it hard off-road, yes. FMI rear bump stop kits work on stock trucks, and on most platforms the rear kit bolts on.

Are FMI bump stop kits bolt-on?

The Raptor, Bronco, Bronco Raptor and Ranger Raptor rear kits bolt on. The TRX and RHO rear cans install in the factory spring buckets with minimal modifications. The front kits bolt to the factory lower arm, but the bump stop mount welds to the frame.

Do I need a limit strap as well?

On a truck with extended travel, yes. Without one the shock or CV joint becomes the droop limiter. The FMI front kits include both.

Should I use a bump stop spacer instead?

Only on a leaf-spring Gen 1 or Gen 2 Raptor that has switched to aftermarket springs, which removes the factory 1.5" riser block. Otherwise a spacer that moves the stock bump stop down can take away wheel travel when it is not done properly.

Will bump stops make the ride harsh?

No. They only engage near the end of the compression stroke, so the truck stops crashing into its own limits.

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