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

Built for rigs that carry more, travel farther, and demand serious performance off-road, the Flatout Suspension GR40R takes the proven rally-inspired foundation of the GR40 and adds external reservoirs to all four shocks for increased cooling capacity, durability, and fade resistance.

The increased oil volume helps the shocks stay cooler during extended off-road use, providing consistent damping performance when your vehicle is loaded with a rooftop tent, recovery gear, bumpers, tire carriers, or other adventure equipment.

Whether you're crawling technical trails, pounding washboard roads, navigating rough backcountry terrain, or traveling long-distance with a heavily equipped rig, the GR40R is engineered to deliver the control, durability, and endurance serious off-road builds demand.

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 capacity helps control operating temperatures and resist shock fade during extended, high-demand driving.

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

• Bypass Piston Valving — Helps smooth out washboard roads and smaller impacts while maintaining control through larger hits and drops.

• 1-Way Rebound Adjustability — Tune damping characteristics for improved comfort on-road and control off-road.

• Overload-Capable Springs — Optional spring upgrades accommodate additional weight from rooftop tents, bumpers, winches, spare tires, and recovery equipment.

• Rebuildable Design — Designed for long-term serviceability, making the GR40R ideal for vehicles that see frequent off-road and expedition use.

• Electroplated Shock Bodies — Enhanced corrosion resistance designed to withstand years of exposure to mud, snow, water, and road salt.

Who Is the GR40R For?

Overlanders & Expedition Rigs
Ideal for trucks and SUVs carrying rooftop tents, recovery equipment, camping gear, and off-road trailers.

Hardcore Off-Roaders
Built for drivers tackling rocks, mud, sand, washboard roads, and technical trails where suspension durability matters.

Heavy-Build Vehicles
A strong choice for rigs equipped with armor, winches, aftermarket bumpers, spare tires, and other accessories that add significant weight.

Adventure Enthusiasts
For anyone looking for a suspension system engineered for increased capability, durability, and long-term off-road use.

Why Upgrade to the GR40R?

The GR40R is designed to provide consistent suspension performance when your vehicle is pushed harder and loaded heavier. External reservoirs increase oil capacity and help manage heat, while adjustable rebound damping allows you to fine-tune the suspension for different terrain and vehicle loads.

With heavy-duty construction, rebuildable shocks, corrosion-resistant components, and overload-capable spring options, the GR40R is built to handle everything from demanding off-road use to extended backcountry expeditions.

GR40R Benefits

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

• Increased durability compared to conventional shock and spring setups

• Adjustable rebound damping for improved ride quality and control

• Supports heavier vehicle builds and additional equipment

• Built for demanding trails, overlanding, and backcountry adventures

• Rebuildable for long-term serviceability

• Designed for serious off-road performance and endurance

⚠️ 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.