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

The Flatout Suspension GR40R is built for rigs that carry more, go further, 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 on all four shocks for maximum endurance.

By increasing oil capacity, these reservoirs keep shocks running cooler, longer, and fade-free, even when hauling rooftop tents, tire carriers, recovery gear, or towing trailers across punishing terrain. If your rig spends weekends crawling trails, pounding washboard roads, or carrying heavy loads into the backcountry, the GR40R is the suspension upgrade that keeps up.

Key Features of the GR40R Coilovers

• 0–3” Adjustable Ride Height → Optimize stance and clearance for bigger tires and rugged terrain.

• External Reservoirs on All Four Shocks → Increased oil volume prevents overheating and resists damper fade.

• Inverted Heavy-Duty Shock Design → Rally-proven durability for extreme off-road abuse.

• Bypass Piston Valving → Smooths out washboard chatter while absorbing large impacts and drops.

• 1-Way Rebound Adjustability → Tune suspension behavior for light trails, heavy loads, or technical crawling.

• Overload-Capable Springs → Optional spring upgrades for rigs with rooftop tents, bumpers, winches, or gear.

• Rebuildable Design → Long-term serviceability for expedition use.

• Electroplated Shock Bodies → Corrosion resistance rated for 7–10 years in mud, snow, and salt.

Who Is the GR40R For?

• Overlanders & Expedition Rigs → Perfect for trucks and SUVs loaded with rooftop tents, gear, and off-road trailers.

• Hardcore Off-Roaders → Drivers tackling rocks, mud, sand, and rugged trails who need strength and endurance.

• Heavy-Build Vehicles → Outfitted rigs with armor, winches, bumpers, and spare tires that strain lesser suspensions.

• Adventure Enthusiasts → Those who want a system that’s tougher, more capable, and built for long-term abuse.

Customer Benefits

• Fade-free performance with reservoir shocks on all four corners.

• Stronger and longer-lasting than standard shock/spring combos.

• Adjustable rebound for comfort on-road and control off-road.

• Handles heavy loads without sagging or instability.

• Built to conquer long expeditions, trails, and backcountry adventures.