Timbren GMRTT35D Rear Suspension Enhancement System is a heavy-duty suspension upgrade designed to provide additional stability, reduce rear-end sagging, and improve load handling for compatible Chevrolet Silverado and GMC Sierra 2500HD and 3500HD trucks.
Engineered specifically for severe-service applications, this rear suspension kit features patented Aeon hollow rubber springs that automatically respond to changing loads and road conditions. It is particularly suitable for vehicles carrying slide-in campers, salt spreaders, heavy equipment, and other top-heavy loads.
Unlike air suspension systems, the Timbren GMRTT35D requires no compressors, air lines, or pressure adjustments. Its durable, maintenance-free construction provides dependable suspension assistance without adding unnecessary complexity.
Key Features and Benefits
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Severe Service Suspension Support: Specifically designed for heavy-duty applications requiring additional stability when transporting top-heavy loads.
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8,000 lb Rated Spring Capacity: Provides substantial supplemental rear suspension support without increasing the truck’s manufacturer-rated payload or towing capacity.
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Patented Aeon Rubber Springs: Progressive hollow rubber springs automatically respond to changing loads and suspension compression.
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Reduces Rear-End Sagging: Helps minimize excessive suspension compression when carrying heavy cargo or towing.
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Improved Roll Stability: Designed to reduce body roll and excessive swaying during demanding hauling applications.
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Automatic Load Adjustment: Rubber spring technology provides increasing resistance as additional weight compresses the suspension.
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Maintenance-Free Operation: No air lines, compressors, fittings, or regular pressure adjustments required.
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Easy Bolt-On Installation: Vehicle-specific mounting brackets allow installation using basic hand tools without drilling.
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Comfortable Unloaded Driving: Designed to maintain clearance between the rubber springs and contact points when the vehicle is unloaded.
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Durable Heavy-Duty Construction: Built for repeated compression and demanding commercial or recreational applications.
Advanced Severe Service Suspension Technology
The Timbren GMRTT35D features patented Aeon hollow rubber springs engineered to provide progressive suspension support under load.
Unlike conventional suspension components that may provide a relatively constant spring rate, Timbren’s progressive rubber springs increase resistance as additional weight compresses the suspension.
This design allows the system to adapt automatically to different cargo weights and driving conditions.
When carrying heavier loads, the springs engage to provide supplemental support, helping stabilize the vehicle and reduce excessive rear suspension movement.
The Severe Service configuration is specifically intended for applications where controlling body roll and sway is especially important.
Designed for Heavy and Top-Heavy Loads
The Timbren GMRTT35D is particularly useful for truck owners who regularly transport loads that place additional demands on the rear suspension.
Common applications include:
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Salt spreaders and winter maintenance equipment
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Construction and landscaping materials
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Commercial cargo transportation
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Utility and equipment hauling
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Other approved top-heavy hauling applications
The additional suspension support helps improve vehicle stability during demanding working conditions while maintaining the truck’s original load ratings.
Compatible Chevrolet and GMC Trucks
The Timbren GMRTT35D is designed for rear suspension installation on compatible Chevrolet Silverado and GMC Sierra heavy-duty trucks.
Chevrolet Silverado Compatibility
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2011–2026 Chevrolet Silverado 2500HD
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2011–2026 Chevrolet Silverado 3500HD
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2011–2026 Chevrolet Silverado 3500HD Cab and Chassis
GMC Sierra Compatibility
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2011–2026 GMC Sierra 2500HD
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2011–2026 GMC Sierra 3500HD
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2011–2026 GMC Sierra 3500HD Cab and Chassis
The kit supports specified two-wheel-drive and four-wheel-drive configurations.
Vehicle fitment should be verified against the manufacturer’s application guide, including model year, suspension configuration, and factory equipment.
Improved Stability and Load Control
Heavy loads can cause excessive rear suspension compression, vehicle swaying, and reduced handling stability.
The Timbren GMRTT35D provides supplemental support to help control suspension movement when the truck is carrying additional weight.
Its progressive spring design helps:
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Reduce rear suspension sagging
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Improve resistance to body roll
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Minimize excessive side-to-side movement
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Provide additional stability with top-heavy cargo
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Cushion certain road impacts
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Support more controlled handling under load
The system is intended to complement the factory suspension rather than replace the vehicle’s original springs or shock absorbers.
Maintenance-Free Suspension Performance
One of the main advantages of Timbren’s Suspension Enhancement System is its simple mechanical design.
Unlike air helper springs, the GMRTT35D does not depend on pressurized air to provide supplemental suspension support.
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No air compressor required
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No manual pressure adjustments
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No electrical connections
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Automatic response to changing loads
Once correctly installed, the rubber springs provide progressive suspension assistance without requiring regular adjustments.
Simple Bolt-On Installation
The Timbren GMRTT35D features a vehicle-specific mounting design intended to make installation straightforward.
The kit uses existing suspension mounting locations and does not require drilling for the specified applications.
Installation can be performed with basic hand tools by following the manufacturer’s instructions.
The kit includes:
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Two patented Aeon hollow rubber spring assemblies
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Two vehicle-specific mounting brackets
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Necessary mounting hardware
The components work together to provide supplemental rear suspension support for compatible Chevrolet and GMC trucks.
Product Specifications
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Product Type: Rear Suspension Enhancement System
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Kit Classification: Severe Service
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Installation Position: Rear
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Vehicle Compatibility: Chevrolet Silverado and GMC Sierra 2500HD / 3500HD
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Compatible Model Years: 2011–2026 for specified applications
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Drive Compatibility: 2WD and 4WD
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Spring Technology: Patented Aeon Hollow Rubber Springs
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Spring Capacity Rating: 8,000 lbs
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Spring Material: Heavy-Duty Rubber
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Mounting Type: Frame Mount
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Air Compressor Required: No
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Mounting Hardware: Included
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Quantity: Complete Rear Suspension Kit
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Warranty: Timbren Limited Lifetime Warranty
Important Load Capacity Information
The Timbren GMRTT35D has an 8,000 lb rated spring capacity. This rating applies to the supplemental suspension system and does not increase the truck’s approved payload or towing capabilities.
Installing the kit does not increase the vehicle’s Gross Vehicle Weight Rating (GVWR), Gross Axle Weight Rating (GAWR), or any other manufacturer-established load limit.
All cargo and towing loads must remain within the vehicle manufacturer’s specifications.
Ideal for Commercial and Recreational Applications
The Timbren GMRTT35D is designed for truck owners who need dependable suspension support when regularly transporting demanding loads.
Its Severe Service configuration is particularly suited to commercial work trucks, winter maintenance vehicles, and pickup trucks carrying slide-in campers.
For these applications, reducing suspension compression and excessive body roll can contribute to more predictable vehicle handling.
The system’s automatic operation also makes it a practical option for users who prefer a mechanical suspension upgrade without the maintenance requirements of an air suspension system.
Heavy-Duty Suspension Support Without Complications
Timbren GMRTT35D Rear Suspension Enhancement Kit combines progressive rubber spring technology, an 8,000 lb rated spring capacity, and durable maintenance-free construction in one heavy-duty suspension upgrade.
Designed for compatible Chevrolet Silverado and GMC Sierra 2500HD and 3500HD trucks, it helps reduce rear-end sagging, improve roll stability, and provide supplemental suspension assistance during demanding hauling applications.
With its straightforward bolt-on installation, automatic load response, and Severe Service design, the Timbren GMRTT35D offers a dependable solution for truck owners seeking additional rear suspension stability without modifying their vehicle’s original weight ratings.
