Timbren SES Suspension Enhancement System for 1999+ Chevrolet/GMC Silverado/Sierra 2500/3500 - Rear Kit

Unstable loads while towing and hauling don’t just make for an uncomfortable ride. Difficult handling, rear sag, and corner sway create dangerous driving conditions — for you, your passengers, and other vehicles.

Whether you’re towing your RV across the country or hauling hay down the highway, Timbren's Timbren SES kits level your load, making for a safe, controlled ride so smooth, you might forget you’re towing altogether.

How? Timbren's Aeon® rubber springs deliver a progressive spring rate. As load increases, Timbren's rubber springs push back harder, eliminating squat, sway, and roll.

What makes Timbren SES kits different from other suspension enhancement systems? Unlike air bags, Timbren's kits require zero post-installation maintenance. And unlike other systems, you can install and haul in under 30 minutes, right from your driveway.

So what’s the difference between Timbren's severe service kits and classic Timbren SES kits?

Both products feature the progressive spring rate of Timbren's Aeon® rubbers springs. As load increases, Timbren's rubber springs push back harder, eliminating squat, sway, and roll.

But Timbren's Timbren SES severe service kits use a single-convoluted Aeon® spring. Designed exclusively for truck campers, these springs resist weight more aggressively to keep your vehicle level and your ride smooth. The result? No more white-knuckling it down the highway — you get a safe, stable handling of your top-heavy load.

TBN-GMRCK25D

Features:

• Reduces sag, sway, and roll when towing and hauling
• Comfortable ride, loaded or unloaded
• DIY installation
• Zero post-installation maintenance

Specs:

• Rated Capacity: 8600 lbs
• Overall kit height = 6.25”

Fitment:

• 2011-2025 Chevrolet/GMC Silverado/Sierra 2500 / 3500 HD 2WD/4WD
• 2011-2025 Chevrolet/GMC Silverado/Sierra 3500 HD Cab & Chassis 2WD/4WD

Notes:

• Even though you’re increasing the spring rate by adding this upgrade, this does not increase the GVWR (Gross Vehicle Weight Rating). Please make sure that the load does not exceed the GVWR set by the manufacturer.
•  After installation, there should be a ½” to 1 ½” gap between the rubber spring and vehicle’s frame — meaning you’ll enjoy a comfortable unloaded ride, too.

Includes:

• 2 x Patented Aeon® SES suspensions (hollow rubber springs )
• 2 x Integrated rubber mounting spacers (assembled with the SES suspensions)
• All necessary hardware

TBN-GMRCK25S

Features:

• Reduces sag, sway, and roll when towing and hauling
• Comfortable ride, loaded or unloaded
• DIY installation
• Zero post-installation maintenance

Specs:

• Rated Capacity: 6,000 lbs

Fitment:

• 2001-2007 Chevrolet/GMC Silverado/Sierra 1500 HD 2WD/4WD
• 1999-2010 Chevrolet/GMC Silverado/Sierra 2500 2WD/4WD

Notes:

• Even though you’re increasing the spring rate by adding this upgrade, this does not increase the GVWR (Gross Vehicle Weight Rating). Please make sure that the load does not exceed the GVWR set by the manufacturer.
• After installation, there should be a ½” to 1 ½” gap between the rubber spring and vehicle’s frame — meaning you’ll enjoy a comfortable unloaded ride, too.
• This kit is compatible with multiple vehicle models, including full-size pickups. Check fitment details to ensure compatibility with your vehicle.

Includes:

• 2x Patented Aeon® suspensions (hollow rubber springs)
• 2x 1" rubber spacers
• 2x Steel mounting brackets
• All necessary hardware

TBN-GMRTT35D (Severe Service Kit)

Features:

• Made exclusively for top-heavy applications that require maximum stability, like truck campers or salt spreaders
• Reduces sag, sway, and roll when hauling top-heavy loads
• Comfortable unloaded ride
• DIY installation
• Zero post-installation maintenance

Specs:

• Rated Capacity: 8,000 lbs

Fitment:

• 2011-2025 Chevrolet/GMC Silverado/Sierra 2500 / 3500 HD 2WD/4WD
• 2011-2025 Chevrolet/GMC Silverado/Sierra 3500 HD Cab & Chassis 2WD/4WD

Notes:

• Even though you’re increasing the spring rate by adding this upgrade, this does not increase the GVWR (Gross Vehicle Weight Rating). Please make sure that the load does not exceed the GVWR set by the manufacturer.
• After installation, there should be a ½” to 1 ½” gap between the rubber spring and vehicle’s frame — meaning you’ll enjoy a comfortable unloaded ride.