Mercedes-Benz W124 Suspension Kit and Links

New Ground Control Coilover

This brand-new, never-mounted Ground Control Coilover Suspension Kit is a custom-built, high-performance setup engineered specifically for the M119-powered Mercedes-Benz W124 models, including the legendary 500E/E500 (124.036) and 400E/E420 (124.034). Designed and manufactured in California by Ground Control Suspension, a company known since 1980 for precision motorsport components, this kit represents one of the most premium suspension upgrades available for the W124 chassis.

Because every Ground Control system is made to order, this kit was custom fabricated for a customer vehicle, but never installed. All components remain new in box exactly as supplied by Ground Control.

Designed for M119 W124 Models

This suspension system fits:

• 500E / E500 (124.036)

• 400E / E420 (124.034)

• Other W124 models using the same five-link rear suspension architecture may also accept the rear adjustable links.

The kit is particularly suited for enthusiasts seeking improved track handling, precise alignment capabilities, and a fully tunable coilover solution far beyond what OEM components can offer.

Complete Kit Contents

1. Ground Control Double-Adjustable Coilovers

• Koni Racing Double Adjustable Struts

• Adjustable damping for both compression and rebound

• Front adjusters accessible externally from under the hood

• Strut housings built with shortened bodies for optimized travel

2. Custom Heavy-Duty Strut Housings

Unlike most aftermarket solutions that reuse or modify OEM housings, this kit includes:

• Fully custom-machined strut housings

• Built from DOM 1026 steel alloy tubing

• Heavy-duty spindle bracket welded on

• Skip-welded gussets to reduce heat distortion

• Reinforced construction for long-term durability and track use

These housings eliminate the weaknesses associated with cutting notches into OEM housings—a method commonly used by lesser suspension kits.

3. Eibach ERS Racing Springs

Top-tier Eibach ERS springs, specifically matched to the W124’s front-engine, rear-drive weight distribution:

• Front: 800 lb/in

• Rear: 1200 lb/in

Paired with Ground Control’s German-made bumpstops, engineered to complement the spring rate and prevent progressive bottoming under heavy load.

4. Fully Adjustable Rear Five-Link System

To maximize adjustability, the kit includes an entire suite of motorsport-grade components for the independent rear suspension:

• Sway Bar Endlinks

• Camber Arms

• Trailing Links

• Track Bars

• Lateral Links

Each component features:

• Motorsport-derived rose joints (spherical bearings)

• Full adjustability for alignment tuning

• Designed for extreme precision in:

  • Camber

  • Toe

  • Caster

These links provide levels of adjustment far beyond the factory configuration, making aggressive track setups possible while improving chassis response.

Engineering Highlights

Custom Height-Adjustable Rear Suspension

• Allows corner balancing

• Enables optimized stance and geometry

• Improves weight distribution for both street and competition driving

Ground Control Threaded Sleeve System

Unlike suspension manufacturers that machine threads directly into the strut body (introducing stress points):

• Ground Control’s solution adds threaded sleeves rather than cutting into the metal

• Eliminates structural weaknesses known as stress risers

• Preserves full structural integrity of the strut housing

This approach aligns with motorsport engineering standards, ensuring maximum safety and performance.

Performance Advantages

1. Improved Handling Precision

The combination of adjustable dampers, high-rate Eibach springs, and rose-jointed links drastically increases steering response and chassis predictability, especially under aggressive cornering.

2. Ideal for Track, Street, or Fast Road

Koni DA struts allow independent fine-tuning of compression and rebound, enabling customized setups for:

• Smooth road comfort

• Performance street driving

• Autocross

• Circuit racing

3. Eliminates Common OEM Weaknesses

Factory W124 suspensions rely on rubber bushings and soft spring rates. This Ground Control kit removes those limitations entirely.

4. Built with Motorsport Intent

Every component—from the strut housings to the adjustable arms—is engineered with racing durability in mind.

Specifications Summary

Manufacturer

Ground Control Suspension Systems, California, USA

Vehicle Compatibility

W124 M119 cars:

• Mercedes-Benz 500E/E500 (124.036)

• Mercedes-Benz 400E/E420 (124.034)

Front Suspension

• Koni Racing Double Adjustable Struts

• Custom shortened housings

• DOM 1026 alloy steel

• Heavy-duty welded spindle bracket

• Ground Control threaded sleeves

• Eibach ERS 800 lb springs

• German-made bumpstops

Rear Suspension

• Adjustable height coilover setup

• Eibach ERS 1200 lb springs

• Adjustable camber arms

• Adjustable trailing links

• Adjustable track bars

• Adjustable lateral links

• Adjustable sway bar endlinks

• Rose-joint spherical bearings

Condition

Brand new in original boxes — never installed.

Why This Kit Stands Out

This Ground Control coilover package is arguably the most robust, best-engineered suspension upgrade available for the 500E/E500 and 400E/E420. While typical coilover conversions modify or cut OEM housings, this kit uses entirely custom-fabricated units, eliminating structural compromises.

The combination of Koni DA struts, Eibach ERS springs, and a fully adjustable rose-jointed rear setup makes this kit ideal for enthusiasts who want:

• Track-ready alignment precision

• Dramatically improved body control

• Motorsport-grade strength

• Height adjustability

• Factory geometry compatibility

It is a rare opportunity to acquire a complete, new-in-box, custom-made Ground Control system for the iconic M119 W124 sedans.