Timbren Rear Suspension Enhancement System – GMRCK25D

Upgrade your truck’s performance and comfort with the Timbren Rear Suspension Enhancement System (GMRCK25D) — the ultimate bolt-on solution designed to eliminate rear-end sag, improve handling, and provide a smoother, more controlled ride when hauling heavy loads or towing trailers.

Crafted specifically for Chevrolet Silverado 2500HD / 3500HD and GMC Sierra 2500HD / 3500HD models, this suspension upgrade replaces factory bump stops with heavy-duty rubber springs that automatically adjust under load. The result? A level stance, improved braking stability, and reduced body roll — without sacrificing ride quality when unloaded.

Key Features & Benefits

• Enhanced Load Support – Prevents rear sag and bottoming out when towing or carrying heavy payloads.

• Maintenance-Free Design – No air lines, compressors, or parts to service — just install and go.

• Heavy-Duty Rubber Construction – Timbren’s signature Aeon® hollow springs deliver consistent, progressive load control.

• Simple Bolt-On Installation – No drilling or cutting required. Installs easily using standard hand tools.

• Improved Stability & Ride Comfort – Reduces sway, bounce, and harsh jolts on rough roads.

• Lifetime Warranty – Built to last the life of your truck, backed by Timbren’s legendary quality guarantee.

Vehicle Compatibility

Fits select Chevrolet Silverado 2500/3500 HD and GMC Sierra 2500/3500 HD models (2011–2023, various trims including LT, LTZ, High Country, WT, AT4, Denali, SLT).
See full fitment details under the “Vehicle Fitment” section.

Why Choose Timbren SES

Whether you’re towing a camper, hauling construction equipment, or carrying a fifth-wheel trailer, the Timbren SES kit gives you confidence, safety, and comfort. It’s the preferred choice for truck owners who want dependable suspension support without the complexity of air systems.

Specifications

• Part Number: GMRCK25D

• Position: Rear

• Material: Natural rubber (Aeon® hollow spring)

• Installation: Bolt-on, no drilling

• Warranty: Lifetime

Chevrolet Silverado 2500 HD: Custom (2020-2023), High Country (2015-2023), LT (2011-2023), LTZ (2011-2023), WT (2011-2023)
Chevrolet Silverado 3500 HD: High Country (2015-2023), LT (2011-2023), LTZ (2011-2023), WT (2011-2023)
GMC Sierra 2500 HD: AT4 (2020-2023), Base (2015-2022), Denali (2011-2023), Pro (2023), SLE (2011-2023), SLT (2011-2023), WT (2011-2014)
GMC Sierra 3500 HD: AT4 (2020-2023), Base (2015-2022), Denali (2011-2023), Pro (2023), SLE (2011-2023), SLT (2011-2023), WT (2011-2014)