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.
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