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Timbren Industries TORTUN4 Rear Suspension Enhancement System Helper Spring Kit

Manufacturer

Timbren Industries

<h3>About Timbren Industries</h3><p>Timbren Industries is a privately held, family-owned company headquartered in Whitby, Ontario, Canada, with a story rooted in a single bold idea: that vehicle suspensions could — and should — work better. Founded in 1968 when entrepreneur Arnold Heron acquired the North American patent rights to a novel hollow rubber spring design known as &quot;Aeon,&quot; Timbren has spent more than 55 years turning that insight into a lineup of suspension upgrade products trusted by weekend haulers, fleet operators, and off-road enthusiasts alike. The company name itself is a nod to family roots — a combination of the names of Arnold's two children, Tim and Brenda.</p><h3>The Aeon® Rubber Spring Advantage</h3><p>At the heart of every Timbren product is the proprietary <strong>Aeon® hollow rubber spring</strong>. Unlike conventional steel leaf springs, which operate at a fixed linear rate, or air suspension systems that require ongoing pressure monitoring and maintenance, Aeon® springs feature a <strong>progressive spring rate</strong> — meaning they work harder as the load increases. The result is a suspension that stays calm and controlled under heavy towing or hauling, yet rides smoothly when the truck is empty. The self-damping properties of the rubber also act similarly to a shock absorber, cushioning road impacts without any additional components.</p><p>This &quot;install it and forget it&quot; philosophy is a key reason Timbren has earned a loyal following. There are no air lines to route, no pressure gauges to check, and no risk of a sudden air leak leaving you stranded with an unstable load on the highway. Every SES kit is engineered to bolt directly onto factory suspension mounting points, making most installations achievable in a driveway without specialty tools.</p><h3>Product Lineup: From Work Trucks to Off-Road Trails</h3><p>Timbren's flagship <strong>Suspension Enhancement System (SES)</strong> product line covers a vast range of vehicles — from compact SUVs to heavy-duty pickups and commercial rigs. The <a href="/13739-timbren-industries-suspension-rubber-helper-spring-kit-14989">Suspension Rubber Helper Spring Kits</a> represent the core of this lineup, replacing OEM bump stops with Aeon® springs that actively engage under load to level the vehicle, reduce squat, and improve towing stability. For trucks equipped with traditional leaf spring rear suspensions, Timbren's <a href="/13739-timbren-industries-leaf-helper-spring-15009">Leaf Helper Springs</a> integrate cleanly with the existing pack to add progressive-rate support without altering ride height when unloaded.</p><p>For drivers who prefer or already run an air suspension setup, Timbren's <a href="/13739-timbren-industries-air-suspension-helper-spring-15005">Air Suspension Helper Springs</a> can complement the existing system, providing a reliable rubber backup that adds stability regardless of air pressure fluctuations. Off-road enthusiasts will appreciate the <a href="/13739-timbren-industries-suspension-multi-purpose-bump-stop-15895">Suspension Multi Purpose Bump Stops</a> — Timbren's Active Off-Road Bumpstop line — which soften the bone-jarring jounce that occurs when a vehicle bottoms out on rough trails, keeping occupants comfortable and suspension components protected. Timbren also produces <a href="/13739-timbren-industries-coil-spring-support-10882">Coil Spring Support</a> solutions for vehicles with independent front and rear coil suspension setups, broadening their coverage across modern truck and SUV platforms.</p><h3>A Legacy Built on Innovation and Reliability</h3><p>Timbren's products have found their way onto everything from daily-driver pickups to Mack and Kenworth big rigs, a testament to the scalability and durability of the Aeon® design. The company backs every SES kit with a <strong>Lifetime Warranty</strong> and a 100-Day Satisfaction Guarantee, reflecting decades of confidence in the technology. Whether you are towing a fifth-wheel camper, hauling a contractor's payload, or navigating rocky back-country trails, Timbren Industries offers a suspension solution engineered for the real world — not just ideal road conditions.

Part Number

TORTUN4
07/13/2036 12:46 PM
Sale Price

$269.36

In Stock (10+)

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Usually delivered within 2 days

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Product Details

The Timbren Industries TORTUN4 Suspension Enhancement System is a rear helper spring kit designed to eliminate suspension sag and improve handling when towing or hauling heavy loads. This bolt-on system features Timbren's patented Aeon hollow rubber springs that deliver a progressive spring rate, automatically adjusting to load conditions to eliminate rear squat, sway, and body roll.

Key Features:

  • 6,000 lb maximum load capacity for heavy-duty towing and hauling applications
  • Patented Aeon hollow rubber springs with progressive spring rate technology
  • Completely maintenance-free operation—no air lines, compressors, or pressure adjustments required
  • Bolt-on installation in under 30 minutes with basic hand tools—no drilling required
  • Black powder-coated steel mounting brackets for corrosion resistance
  • Maintains ½" to 1½" gap when unloaded for comfortable empty ride quality
  • Works with factory suspension to preserve soft ride while providing load support when needed

What's Included:

  • 2 Aeon hollow rubber springs
  • 2 steel mounting brackets
  • All necessary hardware for complete installation

Unlike air bag suspension systems that require ongoing maintenance and adjustments, the Timbren SES is a true set-it-and-forget-it solution. The hollow rubber springs cannot be punctured or popped, making them ideal for off-road use and work trucks. This system improves roll stability, reduces trailer sway, cushions road shocks, and helps level your vehicle under load—all while maintaining factory ride comfort when unloaded. ISO9001:2000 certified quality ensures reliable performance backed by Timbren's lifetime warranty.

Note: This system improves suspension performance but does not increase the vehicle's GVWR (Gross Vehicle Weight Rating). Never exceed the manufacturer's weight rating.

Products specifications

Prop 65 Yes/No

No

Grade Type

Performance

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Easy ordering

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