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Black rubber rear air spring with metal end caps and convoluted bellows shape

Unity

Unity Rear Air Spring 15-514800-HD Heavy Duty

SKU CH-6C24-Y7MKZ

Heavy-duty rear air spring restores air suspension on 2002-2009 GM and Isuzu SUVs

  • Heavy-duty rear air spring restores safe air ride
  • Fits 2002-2006 GMC Envoy XL and 2004-2005 Envoy XUV
  • Compatible with 2003-2008 Isuzu Ascender models
  • Replaces suspension on 2002-2004 Oldsmobile Bravada
  • Works with 2005-2009 Saab 9-7x heavy-duty variants

Rear Air Spring for Heavy-Duty SUVs

The Unity 15-514800-HD rear air spring is built for heavy-duty models of the GMC Envoy XL, Envoy XUV, Isuzu Ascender, Oldsmobile Bravada and Saab 9-7x. It replaces a worn factory unit to restore the original air suspension function. The part fits model years from 2002 through 2009 depending on the specific vehicle. It is designed for a trouble-free installation that returns the system to proper operation.

Normal Ride Quality and System Load

The air spring supports the rear axle at the correct ride height during everyday driving. It absorbs road irregularities to maintain a comfortable air ride for passengers. The rubber and metal construction handles the static weight of the heavy-duty chassis without excessive deflection. Proper inflation keeps the suspension geometry aligned for predictable handling.

Sustained Load and Extended Travel

Under continuous heavy loads or when towing, the spring maintains pressure to prevent the rear from sagging over long distances. It cycles through full compression and rebound events on rough terrain without losing structural integrity. The design resists fatigue from repeated inflation and deflation cycles across the suspension range. This durability ensures the air suspension system remains reliable through extended heavy-duty use.

Highlights

  • Heavy-duty rear air spring restores safe air ride
  • Fits 2002-2006 GMC Envoy XL and 2004-2005 Envoy XUV
  • Compatible with 2003-2008 Isuzu Ascender models
  • Replaces suspension on 2002-2004 Oldsmobile Bravada
  • Works with 2005-2009 Saab 9-7x heavy-duty variants

Specifications

BrandUNITY

Questions about this item

How is the Unity 15-514800-HD rear air spring installed, and which step is often missed?

The spring bolts into the factory rear suspension mounts on the listed GMC Envoy, Isuzu Ascender, Oldsmobile Bravada and Saab 9-7x models. The step often missed is verifying the vehicle is a Heavy Duty model before fitting, because the part is not compatible with standard-duty versions.

What maintenance or replacement will the 15-514800-HD air spring need later?

Inspect the rubber bellows for cracking or air leaks at each oil change. Replace the spring if it no longer holds pressure or shows sidewall damage; the heavy-duty construction is built for long service life under load.

What limit appears first on the 15-514800-HD under sustained heavy use?

Continuous maximum-load operation can overheat the air compressor that feeds the spring, causing the system to hit its thermal protection limit before the spring itself reaches a mechanical limit.

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