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Cardboard box with Unity rear conversion kit label

Unity

Unity 30-514800-HD Rear Conversion Kit

SKU CH-QKF9-HB746

Converts rear air suspension to coil springs on select 2002-2009 GM and Isuzu SUVs

  • Converts air suspension to reliable passive setup
  • Fits 2002-2006 GMC Envoy XL models
  • Compatible with 2003-2008 Isuzu Ascender vehicles
  • Suits 2005-2009 Saab 9-7x applications
  • Designed for 3rd row and light towing models

Rear Air-Spring Conversion Kit

This Unity 30-514800-HD kit replaces the factory rear air suspension with passive steel springs on compatible GMC, Isuzu, Oldsmobile and Saab SUVs. It is built for owners who want to eliminate air-ride leaks and compressor failures without altering the vehicle's original ride height or load rating.

Bolt-In Steel Spring Components

The package supplies the springs and hardware required for a direct retrofit, removing the need for air lines, sensors or electronic modules. Installation follows the original mounting points so no fabrication or welding is involved, and the conversion retains the stock suspension geometry.

Suits DIYers Fixing Failed Air Ride

Ideal for technicians or experienced owners addressing sagging rears, warning lights or repeated compressor replacements on the listed 2002-2009 models. Not suited for vehicles equipped with third-row seating or light-towing packages, nor for anyone needing adjustable ride height or automatic load levelling.

How it compares

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

Price $74.99
Cheaper than about 59% of the 1,702 comparable items (median $86.99).

Specifications

Product
Brand nameUNITY

Questions about this item

Will the steel springs in this rear conversion kit need periodic replacement?

The kit converts the original air suspension to steel springs that are built for long-lasting reliability and do not have a scheduled replacement interval.

What is the first limit reached when the converted suspension is driven hard on a 2002-2006 GMC Envoy XL?

The steel springs are engineered to handle the vehicle's rated load, so the practical limit is the axle and chassis capacity rather than the springs themselves.

Does the kit add any noise, heat or extra power draw once the air compressor is removed?

The passive steel-spring setup eliminates the air compressor, so there is no added electrical load, pump noise or heat from the original air-ride system.

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