Terrafirma Heavy Duty 2 Inch Air to Coil Conversion Kit for Discovery 3 & Discovery 4

Terrafirma Heavy Duty 2 Inch Air to Coil Conversion Kit for Discovery 3 & Discovery 4

Replace the factory air suspension on your Discovery 3 or Discovery 4 with this premium Terrafirma Heavy Duty 2 Inch Air to Coil Conversion Kit. Designed specifically for expedition vehicles, overland builds, towing and demanding off-road use, this complete conversion provides approximately 2 inches (50mm) of suspension lift, significantly improves long-term reliability and increases load carrying capability.

As Discovery 3 and Discovery 4 vehicles get older, air suspension components such as compressors, airbags, valve blocks and height sensors can become expensive to repair or replace. Converting to heavy-duty coil springs eliminates these common failure points while providing a dependable suspension system built to cope with heavy loads, rough terrain and long-distance travel.

Unlike basic air suspension delete kits, this genuine Terrafirma system includes four fully assembled heavy-duty coil strut assemblies together with an intelligent electronic EAS bypass module, allowing important factory vehicle systems to continue operating correctly after the conversion.

Why choose the Terrafirma Heavy Duty Conversion Kit?

• Premium genuine Terrafirma suspension conversion system
• Converts factory air suspension to heavy-duty coil springs
• Approximately 2 inch (50mm) suspension lift for increased ground clearance
• Heavy-duty springs and dampers designed for expedition, towing and heavily loaded vehicles
• Eliminates future replacement costs associated with ageing airbags, compressors, valve blocks and height sensors
• Four fully assembled strut units require no spring compressors during installation
• Uses the vehicle's original suspension mounting points for straightforward installation
• Designed specifically for Discovery 3 and Discovery 4 applications

Intelligent EAS Bypass Module

Rather than simply disabling the suspension system, the supplied intelligent electronic EAS bypass module integrates with the vehicle's existing electronics to allow important factory systems to continue operating correctly after the conversion.

• Maintains Terrain Response functionality
• Retains automatic headlamp levelling
• Prevents permanent air suspension warning messages during normal operation
• Maintains dashboard information display functionality
• Vehicle-specific wiring harnesses included for installation

Ideal for

• Expedition and overland vehicles
• Heavy towing applications
• Commercial and utility vehicles
• Remote travel where maximum reliability is essential
• Owners looking to permanently replace ageing air suspension systems

Kit Contents

• 2 x Front heavy-duty pre-assembled coil spring struts
• 2 x Rear heavy-duty pre-assembled coil spring struts
• Electronic EAS bypass module
• Vehicle-specific wiring harnesses
• Heat shrink tubing
• Cable ties
• New top mounting lock nuts

Suitable for the following Land Rover models

• Discovery 3 (L319), 2005-2009
• Discovery 4 (L319), 2010-2016
• Range Rover Sport (L320), 2005-2010, WITHOUT DSC / ASC / ACE

Frequently Asked Questions

Do I need spring compressors?

No. All four suspension struts are supplied fully assembled and ready to install, making fitting quicker, easier and safer.

Will I lose Terrain Response?

No. The supplied intelligent EAS bypass module is designed to retain important factory functions including Terrain Response, automatic headlamp levelling and dashboard integration after the air suspension has been removed.

Is this suitable for expedition and overland vehicles?

Yes. This heavy-duty Terrafirma kit has been specifically developed for vehicles operating in demanding conditions where long-term durability, increased load carrying capability and reduced maintenance requirements are priorities.

Installation Advice

Terrafirma recommends checking the vehicle for any existing suspension or electrical fault codes with a suitable diagnostic tool before beginning the conversion. This helps identify any unrelated faults before installation and ensures the best possible results.

If you're looking for one of the most comprehensive and reliable air to coil conversion kits available for Discovery 3 or Discovery 4, this genuine Terrafirma Heavy Duty kit delivers improved durability, increased ground clearance and reduced long-term maintenance costs whilst retaining important factory vehicle functionality.