Unity 15-553000 Air Suspension Spring - Rear

Rear Air Suspension Spring for Expedition and Navigator

Restore rear ride support with this Unity air suspension spring/bag, part number 15-553000. It is built for rear applications on select Ford Expedition and Lincoln Navigator models with air suspension, excluding all-wheel drive versions.

Key Features

• Rear air suspension spring/bag for the listed applications
• Built to OEM specifications for proper fit and function
• From Unity Automotive, a suspension-focused aftermarket brand with more than 40 years of manufacturing experience
• Part number 15-553000 for easy identification
• Cross-reference: Dorman OE Solutions 949-252

Application Details

Compatible with 1997-2002 Ford Expedition, rear, excluding all-wheel drive, and 1998-2002 Lincoln Navigator, rear, excluding all-wheel drive. This Unity air suspension spring/bag is intended for rear suspension service on these Ford Expedition and Lincoln Navigator applications and supports OE-style replacement needs. Part number 15-553000 is also referenced by interchange numbers 3U2Z5580KA and F75Z5A891AA.

Common Problems It Can Address

• Rear end sagging from a worn air spring
• Uneven ride height at the back of the vehicle
• Air suspension leakage at the spring/bag assembly
• Loss of rear suspension support under load
• Ride quality changes caused by aging air suspension components

Installation Notes and Tips

Verify rear fitment by year, model, and drivetrain before installation. This part is for rear use only and excludes all-wheel drive vehicles. Inspect related air suspension components, lines, and mounting points during replacement to confirm the system is ready for service.

Quality Assurance

Unity Automotive builds aftermarket suspension parts to OEM specifications and focuses on long-term durability and consistent fit. The brand’s suspension line is supported by decades of manufacturing experience and an established aftermarket infrastructure.