backed by a lifetime guarantee

Suspension Solutions for DIY and Specialty Applications

If you need more than standard bolt-on parts, Builder Kits are built for flexibility. Designed for custom installs, these kits give you the core SumoSpring® unit—so you can adapt, fabricate, and tailor the setup to your unique vehicle requirements.
Compare Builder Kits

How Builder Kits Work

SumoSprings Builder’s Kits are available in three different heights, each offered in three unique densities. Designed to mount within ½”–1″ of the contact point, these kits can be installed with up to two 1″ spacers for additional flexibility.

Please note: kits are sold without hardware or bracketry. For installation, we recommend using Grade 8, ⅜” hardware (or equivalent).

Compare Kits
Totally Customizable
Each kit includes only the core SumoSpring unit—no brackets—so you can build your own mounting style.
Choose Your Height
Options for 5″, 6″, or 7″ heights with included spacers let you fine-tune clearance and ride stance.
Simple Fit Parameters
Maintain a ½″ to 1″ air gap at ride height for optimal performance and reliability.
You Supply the Hardware
Fabricate brackets and use Grade 8 hardware for strength and mounting flexibility.
How It Works

Custom Support That Fits Your Build

Builder Kits provide the same high-performance SumoSpring cores found in our standard kits, but stripped down for full customization. Choose your load rating, stack spacers to adjust height, and supply your own hardware for mounting.

This flexibility allows you to create tailored bump-stop or helper spring setups that work with your chassis—not against it. Whether you’re lifting, lowering, or fabricating something unique, Builder Kits adapt to your needs.

Find the Right Kit for You

Built to Withstand the Toughest Environments

Engineered for Custom Demands

Strength You Can Count On
Crafted with the same durable, high-density microcellular polyurethane used across the entire SumoSprings® lineup, Builder Kits are built to handle the toughest conditions without breaking down or wearing out. This unique material is resistant to heat, cold, road chemicals, and UV exposure—ensuring consistent performance whether you’re crossing desert trails, hauling in humid coastal climates, or braving snowy mountain passes.

Because they contain no air lines, no compressors, and no moving parts, Builder Kits eliminate the common failure points found in traditional suspension add-ons. The result is a simple, rock-solid solution you can fabricate once and rely on for years. From punishing off-road use and demanding shop installs to custom chassis builds and specialty rigs, Builder Kits deliver long-term reliability you can trust—no maintenance, no downtime, just dependable performance wherever your build takes you.
Find the Right Kit for You
A smarter choice than fixed bump-stops or rigid add-on systems.

Why Builder Kits Beat Other Options

Fixed bump-stop kits and add-a-leaf systems often force a one-size-fits-all solution that doesn’t respect the uniqueness of your build. They can reduce suspension travel, stiffen the ride to the point of discomfort, or require constant adjustments that complicate the install process. On lifted vehicles, they may even create fitment issues that compromise clearance or articulation, making them more of a limitation than a solution.

Builder Kits are different. By giving you multiple height options, a choice of load ratings, and the freedom to fabricate your own hardware, they put the control back in your hands. Instead of forcing your vehicle to fit a generic design, you create the suspension solution your rig actually needs. Best of all, this customization comes without compromise—you still get the legendary durability, comfort, and safety SuperSprings products are known for. Whether you’re building for off-road performance, fleet reliability, or a custom van conversion, Builder Kits ensure you’re never boxed in by someone else’s idea of “universal fit.”
Find the Right Kit for You

Why the Industry Trusts SuperSprings

Built for Fabricators, Loved by DIYers

The go-to suspension core for shops, builders, and custom installers.
Professional upfitters, specialty shops, and DIY builders rely on Builder Kits to solve suspension challenges that off-the-shelf kits can’t handle. By stocking the core units and fabricating their own brackets, shops gain flexibility for quick turnarounds, while DIYers get freedom to customize their rigs at home. Backed by our Lifetime Guarantee, Builder Kits deliver long-term confidence for any project.
Find the Right Kit for You

One SOLUTION, Unlimited Possibilities

Builder Kits were created for scenarios where standard bolt-on parts just don’t cut it. Their adaptable design makes them ideal for:

✅ Lifted Trucks – Create custom bump-stop spacing that works with your suspension travel and articulation, preventing bottom-outs without compromising flex.
✅ Overland & Off-Road Builds – Engineer bump-stop or helper spring solutions that fit around aftermarket armor, long-travel suspensions, and rooftop tent setups.
✅ Vans & Trailers – Solve clearance challenges in tight spaces where traditional kits won’t fit, while still getting the load support you need for stability and control.
✅ Specialty Vehicles & Conversions – Perfect for unique chassis setups like flatbeds, expedition rigs, camper conversions, or trailers with non-standard mounting points.
✅ Pro Shops & Fabricators – Keep core units in stock and build your own brackets in-house for faster turnaround times and custom-tailored solutions.

Where rigid “universal” parts fall short, Builder Kits open the door to creativity. They give you the freedom to mix, match, and fine-tune every element of your suspension upgrade, while still being backed by SuperSprings’ proven materials and Lifetime Guarantee. Builder Kits provide the building blocks to engineer suspension that truly fits your vehicle and your vision.

Find the Right Kit for You

Find the Right Builder's Kit for Your Needs

5" Kits (No Spacer)

6" Kits (comes with 1 Spacer)

7" Kits (comes with two Spacers)

Subscribe To Our Weekly Newsletter

Join our email list for the latest news, tips, blog posts, and deals!