Adventure doesn’t stop for heavy loads. Trucks like the Tacoma, Tundra, Titan, and X-Runner often carry campers, ATVs, or off-road gear that strain factory suspension. The Timbren SES TORTUN4 Rear Kit is built for Toyota and Nissan trucks, adding progressive support to eliminate sag and protect against bottom-outs. With rugged Aeon® rubber springs and simple bolt-on installation, this kit is the no-maintenance way to keep your truck level on trails and highways.

Key Features & Specs:

• Designed for Nissan Titan, Toyota Tacoma, Tundra & X-Runner
• Progressive Aeon® rubber springs engage automatically under load
• Eliminates rear-end sag and sway during towing or hauling
• Reduces bottom-outs on trails and uneven terrain
• Bolt-on install with included steel brackets & hardware
• Maintenance-free with a lifetime warranty

Rear Suspension Enhancement System for Nissan Titan, Toyota Tacoma, Tundra & X-Runner

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, our Timbren rear suspension enhancement system provides the strength and stability needed for a safer, more controlled ride. Designed for a variety of vehicle models, like the Toyota Tacoma and Toyota Tundra, this kit eliminates rear sag and enhances handling under heavy loads. Check the fitment details to ensure compatibility with your vehicle.

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

What makes Timbren SES kits different from other suspension enhancement systems? Unlike air bags, which require ongoing adjustments, the Timbren rear suspension enhancement system is completely maintenance-free. And unlike other systems, you can install and haul in under 30 minutes, right from your driveway.