Flatout Suspension GR40R – Heavy-Duty Coilover System with External Reservoirs

The Flatout Suspension GR40R is built for rigs that carry more, travel farther, and push harder off-road. Designed for serious off-roaders, overlanders, and adventure builds, the GR40R takes the proven rally-strength foundation of the GR40 and adds external reservoirs to all four shocks for increased cooling capacity, endurance, and resistance to shock fade.

By increasing oil capacity, the external reservoirs help the shocks manage heat during extended, demanding use—providing more consistent damping performance when carrying rooftop tents, tire carriers, recovery equipment, heavy accessories, or towing off-road trailers across challenging terrain.

Whether your rig spends weekends crawling technical trails, pounding washboard roads, navigating rough backcountry terrain, or carrying heavy loads into remote areas, the GR40R is engineered to keep up.

IMPORTANT: The Flatout Suspension GR40R is intended for OFF-ROAD USE ONLY and is not designed or intended for use on public roads. Please allow 8–10 weeks for production and delivery. This product is built to order.

Key Features

• 0–3" Adjustable Ride Height — Optimize ride height, stance, and ground clearance for larger tires and demanding terrain.

• External Reservoirs on All Four Shocks — Increased oil volume helps manage operating temperatures and resist damper fade during extended off-road use.

• Inverted Heavy-Duty Shock Design — Rally-inspired construction provides increased strength and durability for aggressive off-road applications.

• Bypass Piston Valving — Helps smooth out washboard roads and smaller impacts while providing controlled damping through larger hits and drops.

• 1-Way Rebound Adjustability — Tune suspension response for different terrain, vehicle loads, and driving conditions.

• Overload-Capable Springs — Optional spring upgrades accommodate additional weight from rooftop tents, bumpers, winches, tire carriers, recovery equipment, and other gear.

• Rebuildable Design — Provides long-term serviceability and maintenance options for vehicles used extensively off-road.

• Electroplated Shock Bodies — Corrosion-resistant construction designed to provide 7–10 years of protection in demanding environments.

Who Is the GR40R For?

Overlanders & Expedition Rigs

Ideal for trucks and SUVs carrying rooftop tents, camping equipment, recovery gear, spare tires, and off-road trailers.

Hardcore Off-Roaders

Designed for drivers tackling rocks, mud, sand, washboard roads, technical trails, and other demanding terrain where suspension strength and endurance are critical.

Heavy-Build Vehicles

A strong choice for rigs equipped with armor, winches, aftermarket bumpers, tire carriers, spare tires, and other accessories that add significant weight.

Adventure & Expedition Builds

For drivers who need a suspension system capable of handling extended backcountry travel, heavy loads, and repeated off-road abuse.

Why Upgrade to the GR40R?

The GR40R is designed to maintain consistent suspension performance under heat, load, and extended off-road use. External reservoirs increase oil capacity and help manage operating temperatures, while adjustable rebound damping allows the suspension to be tuned to match different terrain and vehicle configurations.

Combined with heavy-duty inverted shocks, bypass piston valving, customizable spring rates, and rebuildable components, the GR40R provides the durability and adjustability required for serious off-road builds.

GR40R Benefits

• External reservoirs on all four shocks for improved heat management

• Increased resistance to shock fade during extended off-road use

• Heavy-duty inverted shock construction

• Adjustable rebound damping for suspension tuning

• Supports heavier vehicle builds and additional equipment

• Optional spring rates for vehicles with increased payload

• Rebuildable design for long-term serviceability

• Corrosion-resistant shock bodies

• Built for demanding trails, overlanding, and backcountry expeditions

Built for Serious Off-Road Use

The Flatout Suspension GR40R is more than a traditional lift and shock package. It's a heavy-duty suspension system designed for vehicles that spend significant time carrying additional weight and operating in demanding off-road environments.

From technical trails and washboard roads to extended overland expeditions, the GR40R delivers the strength, cooling capacity, adjustability, and durability needed when your vehicle and suspension are pushed to their limits.

⚠️ Ordering & Lead Time

OFF-ROAD USE ONLY. This suspension system is designed specifically for off-road applications and is not intended for use on public roads.

Estimated lead time: 8–10 weeks. The GR40R is built to order. Please allow approximately 8–10 weeks for production and delivery before placing your order.