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Unity front conversion kit for 1999-2006 Mercedes-Benz S-Class

Unity

Unity 31-113400 Front Conversion Kit 1999-2006 Mercedes-Benz S-Class

SKU CH-KD5Y-2KFZE

Front conversion kit retrofits steel springs on 1999-2006 Mercedes-Benz S-Class models excluding 4Matic

  • Converts air suspension to reliable steel springs
  • Fits 1999-2006 S320, S350, S420, S430, S500, S600
  • Excludes 4Matic models for correct application
  • 50 years Unity aftermarket manufacturing experience
  • Trouble-free installation with long-lasting reliability

Unity Front Conversion Kit

The Unity 31-113400 front conversion kit replaces the factory air suspension on select Mercedes-Benz S-Class models from 1999 to 2006. It converts the front axle to a passive steel-spring setup built for long-term reliability.

Fits S320 S420 S430 S500 S600 without 4Matic

This kit suits owners of rear-wheel-drive S320, S420, S430, S500 and S600 sedans who want to eliminate air-ride leaks and compressor failures. It does not fit 4Matic all-wheel-drive variants or any model outside the listed years.

Excludes 4Matic all-wheel-drive models

The single specification that decides fitment is the drivetrain: the kit is engineered only for non-4Matic chassis. Buyers with 4Matic models must seek a different solution.

How it compares

Measured against everything we stock in Brake Service Tools & Presses, at today’s prices. Recalculated every night.

Price $492.99
Pricier than about 92% of the 1,702 comparable items (median $86.99).

Specifications

Product
Brand nameUNITY

Questions about this item

Will the kit hold up to daily driving on a 2006 S600 without the air suspension failing again?

The kit replaces the factory air springs with steel springs designed for long-term reliability on 1999–2006 S-Class models including the S600.

Does the conversion make the ride noticeably harsher or louder on rough roads?

The steel-spring setup is engineered to deliver a trouble-free installation and a stable ride without the air-compressor noise of the original system.

Do I need any special tools or additional parts to install this on a 1999 S420?

The kit is a direct retrofit for 1999–2006 S-Class models excluding 4Matic, so standard suspension tools are all that is required.

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