Unity 30-540000-HD Air Spring to Coil Spring Conversion Kit - Rear

Rear Air Spring to Coil Spring Conversion

Restore the rear suspension on select Ford, Lincoln, and Mercury vehicles with the Unity 30-540000-HD heavy duty electronic to passive air spring to coil spring conversion kit. This rear conversion kit replaces air/electronic rear suspension with a standard coil spring setup for a lower-cost alternative to air suspension service.

Key Features

• Rear air spring to coil spring conversion for select applications
• Fits 1992-2011 Ford Crown Victoria, rear
• Fits 1989-2011 Lincoln Town Car, rear
• Fits 1989-2011 Mercury Grand Marquis, rear
• Fits 2003-2004 Mercury Marauder, rear
• Built to OEM specifications by Unity Automotive
• Designed for vehicles originally equipped with electronic or air rear suspension
• Part number 30-540000-HD

Product Details

The Unity Heavy Duty Electronic to Passive Air Spring to Coil Spring Conversion Kit is a rear suspension solution for drivers who want to replace failing air suspension components with a conventional coil spring arrangement. It is a fitment-based option for the Ford Crown Victoria, Lincoln Town Car, Mercury Grand Marquis, and Mercury Marauder, with application coverage spanning model years from 1989 through 2011. Unity Automotive has decades of aftermarket suspension experience and builds its suspension products to OEM specifications for consistent assembly and fit.

This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application. Part number 30-540000-HD is a practical replacement choice when servicing rear air/electronic suspension systems on high-mileage full-size Ford and Mercury platforms.

Common Problems This Kit Can Address

• Rear ride height issues caused by aging air suspension components
• Costly repairs tied to leaking or failing electronic air springs
• Repeated compressor or leveling system service on older vehicles
• Uneven rear stance from worn suspension parts
• Need for a standard coil spring conversion on commercial-use vehicles

Installation Notes and Tips

Verify rear suspension configuration before ordering and confirm the vehicle is listed in the fitment data. This kit is for rear applications only and is intended for vehicles originally equipped with air or electronic rear suspension. Review the vehicle’s existing suspension layout, inspect related mounting points and isolators, and follow the service procedure for the specific model year.

Quality Assurance

Unity Automotive manufactures aftermarket suspension parts with a focus on OEM-spec construction and long-term durability. The brand’s product line is supported by more than 40 years of aftermarket experience and a customer satisfaction guarantee.