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Unity rear conversion kit boxed for 1999-2003 Lexus RX300

Unity

Unity Rear Conversion Kit 31-516000-AWD for 1999-2003 Lexus RX300

SKU CH-JHSC-KEQ65

Rear conversion kit retrofits steel springs to replace air suspension on 1999-2003 Lexus RX300 AWD models

  • Converts air suspension to reliable coil springs for 1999-2003 Lexus RX300
  • 50 years of aftermarket manufacturing expertise from Unity Automotive
  • Designed for trouble-free installation on AWD models only
  • Steel spring retrofit eliminates air-ride maintenance issues
  • Elite Suspension Line delivers long-lasting passive suspension performance

Rear Conversion Kit for Lexus RX300

The Unity 31-516000-AWD rear conversion kit replaces the factory air suspension on 1999-2003 Lexus RX300 models. It provides a passive steel spring setup designed for long-term reliability. The kit excludes front-wheel-drive variants and targets owners seeking to eliminate air-ride maintenance. Installation restores standard suspension function without electronic complexity.

Replaces Factory Air Suspension

This kit converts the original air spring system to a conventional coil spring arrangement, removing compressors, bags and height sensors from the rear axle. The jump is worth it when air leaks, compressor failure or sensor faults make the original system unreliable. Unity's design aims for a trouble-free installation using existing mounting points. It suits owners who prefer predictable ride behaviour over adjustable damping.

Limits of Passive Steel Spring Conversion

The conversion fixes ride height at a single setting, removing the load-levelling and ride-height adjustment provided by the air system. Heavy rear loads will cause more sag than the active system would allow. The kit does not address front suspension components, so overall handling balance changes. Buyers needing adjustable ride height or automatic load levelling should retain the original air suspension.

Highlights

  • Converts air suspension to reliable coil springs for 1999-2003 Lexus RX300
  • 50 years of aftermarket manufacturing expertise from Unity Automotive
  • Designed for trouble-free installation on AWD models only
  • Steel spring retrofit eliminates air-ride maintenance issues
  • Elite Suspension Line delivers long-lasting passive suspension performance

Specifications

BrandUNITY

Questions about this item

Does the 31-516000-AWD kit fit a 1999 Lexus RX300 with all-wheel drive?

Yes, the kit is built for 1999-2003 RX300 models and the notes exclude front-wheel-drive versions, so it matches your AWD vehicle.

What is the common mistake when installing the rear conversion kit on a 2003 RX300?

Installers often forget to remove the original air-spring lines before bolting in the steel-spring brackets, which leaves the system pressurised and prevents correct alignment.

Will the steel springs in this 516000 kit need periodic replacement?

The steel springs are designed for long-term use without a scheduled replacement interval; only inspect them if ride height changes or unusual noise appears.

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