Gdydi Gmrck15s Rear Bump Stops Helper Spring Kit for Silverado/Sierra 1500 (1999–2021) — 4.75" Load-Boosting Rubber Reinforcement

The Gdydi Gmrck15s rear bump stops are a direct-fit rubber helper spring kit that reinforces rear suspension on 1999–2021 Silverado 1500 and Sierra 1500 trucks, reducing bottoming out and improving ride stability.

If your truck frequently carries heavy loads, tows, or encounters rough roads, the rear suspension can sag or hit the bump stops harshly. The Gmrck15s jounce stop kit replaces the factory bump stops with a hollow rubber design that acts as an auxiliary spring and damper. It restores rear ride height under load, cushions impacts, and helps protect shocks, springs, and the axle from extreme compression.

How does Gdydi Gmrck15s help when I carry heavy loads or tow?

The helper spring kit takes on extra vertical load to limit rear sag and keep the truck closer to its designed ride height. That reduces strain on factory springs and improves control during acceleration, braking, and cornering while loaded.

• Rated load capacity: 8,600 pounds (system-rated reinforcement).
• Kit height: 4.75 inches to provide meaningful lift under load.
• Acts as an auxiliary spring to share load with OEM suspension.
• Direct replacement for OE Gmrck15s-sized bump stops for correct fit.

Will these bump stops protect my shocks and prevent harsh bottoming out?

The Gmrck15s uses a hollow rubber, hydraulic-like pillar that compresses progressively to absorb energy. That design reduces harsh contact at full compression and disperses impact forces that would otherwise transfer to shocks and suspension mounts.

• Hollow rubber geometry provides both spring and damping action.
• Less abrupt axle-to-frame contact on potholes and rough terrain.
• Helps extend shock and spring service life by reducing extreme loads.

Is this a direct fit for my truck and what comes in the kit?

Gdydi designed the Gmrck15s kit as a direct OE-style replacement for compatible Silverado and Sierra models; verify OEM part numbers and fitment before ordering. Each package includes the hardware needed for installation so you can swap the old bump stops quickly.

• Compatibility: Fits 1999–2021 Silverado 1500 and Sierra 1500 (check OEM component number).
• Package contents: 2 bump stops, 2 washers, 2 bolts and nuts—ready to install.
• OE replacement part number reference: Gmrck15s.

How durable is the Gdydi helper spring and what warranty is provided?

The kit is manufactured from improved rubber compounds and reinforced hardware to meet or exceed original factory quality for jounce stops. Gdydi backs the product with a 12-month warranty to cover defects in materials and workmanship under normal use.

• Material: durable hollow rubber engineered for load and impact resistance.
• Hardware included: corrosion-resistant bolts, nuts, and washers.
• Warranty: 12 months on manufacturing defects; customer support available within 24 hours.

Who is this for? The Gdydi Gmrck15s rear bump stop kit is suited for Silverado and Sierra 1500 owners who frequently tow or haul, drive on rough roads, or want to protect factory suspension components from excessive compression. It’s also a practical upgrade for anyone replacing worn OEM bump stops who wants improved load control and a smoother, more controlled rear-end ride under stress.