HomeSuspension > Suspension, Springs and Related ComponentsUnity 30-540000-HD Air Spring to Coil Spring Conversion Kit - Rear
Part #: 30-540000-HD

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

Heavy Duty Electronic to Passive Air Spring to Coil Spring Conversion Kit, Rear
68 vehicles fit this part
Select your vehicle to confirm fitment
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OE Direct Replacement — Bolt-on fit, no modifications needed
Heavy Duty Electronic to Passive Air Spring to Coil Spring Conversion Kit, Rear
Fitment: Ford, Lincoln, and Mercury, Crown Victoria, Town Car, Grand Marquis, and Marauder
Easy Returns — Return within 60 days for a full refund
Fast Shipping — Most orders ship same business day before 1pm CST

Overview of Unity Heavy Duty Air Spring Conversion Kit

The Unity Heavy Duty Electronic to Passive Air Spring to Coil Spring Conversion Kit (part number 30-540000-HD) offers a reliable, economy-grade solution for rear suspension upgrades. Designed for select Ford, Lincoln, and Mercury vehicles from 2003 to 2011, this kit provides a low-cost alternative to air suspension systems.

  • Compatible with Ford Crown Victoria, Lincoln Town Car, Mercury Marauder, and Grand Marquis models
  • Rear position conversion from electronic air springs to passive coil springs
  • Economy product grade for cost-effective suspension repair
  • Fits model years 2003 through 2011
  • Part number 30-540000-HD for precise identification

Product Line Details: Heavy Duty Electronic to Passive Air Spring to Coil Spring Conversion Kit

This product is part of Unity's Heavy Duty Electronic to Passive Air Spring to Coil Spring Conversion Kit line, designed specifically to convert electronic air suspension systems to passive coil spring setups. This line targets vehicles equipped with electronic air springs that require a durable and straightforward conversion to coil springs, providing a practical alternative to maintain rear suspension performance without the complexity of air suspension components.

Detailed Product Description

The 30-540000-HD conversion kit is engineered to replace the rear electronic air springs on select Ford Crown Victoria, Lincoln Town Car, Mercury Marauder, and Grand Marquis models with passive coil springs. Covering model years from 2003 to 2011, this kit addresses the common need for a cost-effective suspension solution. By switching to coil springs, vehicle owners can avoid the higher maintenance and repair costs associated with air suspension systems while maintaining reliable rear suspension support.

Common Applications and Problem Solving

  • Eliminates issues related to failing electronic air springs
  • Reduces maintenance costs associated with air suspension components
  • Provides a stable rear suspension setup for vehicles with worn or damaged air springs
  • Prevents air compressor and sensor failures linked to air suspension systems
  • Offers a straightforward upgrade path for vehicles with problematic air suspension

Installation Notes and Tips

Installation of the 30-540000-HD kit requires removal of the existing electronic air springs and associated components. It is recommended to have the vehicle securely lifted and supported before beginning work. Basic mechanical skills and standard suspension tools are necessary. Follow all manufacturer instructions carefully to ensure proper fitment and safety. This kit is designed specifically for rear suspension use on compatible Ford, Lincoln, and Mercury models.

Quality Assurance and Warranty

Unity provides this conversion kit as an economy-grade product, offering a practical and durable solution for rear suspension conversion. While specific warranty details are not provided, Unity products typically meet industry standards for fit and function. Buyers should verify warranty terms with the distributor or installer prior to purchase.

BrandUnity
Part Number30-540000-HD
PositionHeavy Duty Electronic to Passive Air Spring to Coil Spring Conversion Kit, Rear
Max Year Covered2011
Min Year Covered2003
Most Popular Make / ModelFord Crown Victoria
Most Popular Year2003
PositionRear
Product GradeEconomy
Special NoteLow Cost Alternative To Air Suspension
Total Part VIO669540

This part fits 68 vehicles. Search below:

YearMakeModelPositionNotes
2011FordCrown VictoriaRearIncludes (2) Springs (4) Rubber Isolators Converting Air/Electronic Suspension to Standard Suspension; Heavy Duty; For Commercial Use; Heavy Duty Electronic to Passive Air Spring to Coil Spring Conversion Kit
2011LincolnTown CarRearIncludes (2) Springs (4) Rubber Isolators Converting Air/Electronic Suspension to Standard Suspension; Heavy Duty; For Commercial Use; Heavy Duty Electronic to Passive Air Spring to Coil Spring Conversion Kit
2011MercuryGrand MarquisRearIncludes (2) Springs (4) Rubber Isolators Converting Air/Electronic Suspension to Standard Suspension; Heavy Duty; For Commercial Use; Heavy Duty Electronic to Passive Air Spring to Coil Spring Conversion Kit
2010FordCrown VictoriaRearIncludes (2) Springs (4) Rubber Isolators Converting Air/Electronic Suspension to Standard Suspension; Heavy Duty; For Commercial Use; Heavy Duty Electronic to Passive Air Spring to Coil Spring Conversion Kit
2010LincolnTown CarRearIncludes (2) Springs (4) Rubber Isolators Converting Air/Electronic Suspension to Standard Suspension; Heavy Duty; For Commercial Use; Heavy Duty Electronic to Passive Air Spring to Coil Spring Conversion Kit
2010MercuryGrand MarquisRearIncludes (2) Springs (4) Rubber Isolators Converting Air/Electronic Suspension to Standard Suspension; Heavy Duty; For Commercial Use; Heavy Duty Electronic to Passive Air Spring to Coil Spring Conversion Kit
2009FordCrown VictoriaRearIncludes (2) Springs (4) Rubber Isolators Converting Air/Electronic Suspension to Standard Suspension; Heavy Duty; For Commercial Use; Heavy Duty Electronic to Passive Air Spring to Coil Spring Conversion Kit
2009LincolnTown CarRearIncludes (2) Springs (4) Rubber Isolators Converting Air/Electronic Suspension to Standard Suspension; Heavy Duty; For Commercial Use; Heavy Duty Electronic to Passive Air Spring to Coil Spring Conversion Kit
2009MercuryGrand MarquisRearIncludes (2) Springs (4) Rubber Isolators Converting Air/Electronic Suspension to Standard Suspension; Heavy Duty; For Commercial Use; Heavy Duty Electronic to Passive Air Spring to Coil Spring Conversion Kit
2008FordCrown VictoriaRearIncludes (2) Springs (4) Rubber Isolators Converting Air/Electronic Suspension to Standard Suspension; Heavy Duty; For Commercial Use; Heavy Duty Electronic to Passive Air Spring to Coil Spring Conversion Kit
2008LincolnTown CarRearIncludes (2) Springs (4) Rubber Isolators Converting Air/Electronic Suspension to Standard Suspension; Heavy Duty; For Commercial Use; Heavy Duty Electronic to Passive Air Spring to Coil Spring Conversion Kit
2008MercuryGrand MarquisRearIncludes (2) Springs (4) Rubber Isolators Converting Air/Electronic Suspension to Standard Suspension; Heavy Duty; For Commercial Use; Heavy Duty Electronic to Passive Air Spring to Coil Spring Conversion Kit
2007FordCrown VictoriaRearIncludes (2) Springs (4) Rubber Isolators Converting Air/Electronic Suspension to Standard Suspension; Heavy Duty; For Commercial Use; Heavy Duty Electronic to Passive Air Spring to Coil Spring Conversion Kit
2007LincolnTown CarRearIncludes (2) Springs (4) Rubber Isolators Converting Air/Electronic Suspension to Standard Suspension; Heavy Duty; For Commercial Use; Heavy Duty Electronic to Passive Air Spring to Coil Spring Conversion Kit
2007MercuryGrand MarquisRearIncludes (2) Springs (4) Rubber Isolators Converting Air/Electronic Suspension to Standard Suspension; Heavy Duty; For Commercial Use; Heavy Duty Electronic to Passive Air Spring to Coil Spring Conversion Kit
2006FordCrown VictoriaRearIncludes (2) Springs (4) Rubber Isolators Converting Air/Electronic Suspension to Standard Suspension; Heavy Duty; For Commercial Use; Heavy Duty Electronic to Passive Air Spring to Coil Spring Conversion Kit
2006LincolnTown CarRearIncludes (2) Springs (4) Rubber Isolators Converting Air/Electronic Suspension to Standard Suspension; Heavy Duty; For Commercial Use; Heavy Duty Electronic to Passive Air Spring to Coil Spring Conversion Kit
2006MercuryGrand MarquisRearIncludes (2) Springs (4) Rubber Isolators Converting Air/Electronic Suspension to Standard Suspension; Heavy Duty; For Commercial Use; Heavy Duty Electronic to Passive Air Spring to Coil Spring Conversion Kit
2005FordCrown VictoriaRearIncludes (2) Springs (4) Rubber Isolators Converting Air/Electronic Suspension to Standard Suspension; Heavy Duty; For Commercial Use; Heavy Duty Electronic to Passive Air Spring to Coil Spring Conversion Kit
2005LincolnTown CarRearIncludes (2) Springs (4) Rubber Isolators Converting Air/Electronic Suspension to Standard Suspension; Heavy Duty; For Commercial Use; Heavy Duty Electronic to Passive Air Spring to Coil Spring Conversion Kit
2005MercuryGrand MarquisRearIncludes (2) Springs (4) Rubber Isolators Converting Air/Electronic Suspension to Standard Suspension; Heavy Duty; For Commercial Use; Heavy Duty Electronic to Passive Air Spring to Coil Spring Conversion Kit
2004FordCrown VictoriaRearIncludes (2) Springs (4) Rubber Isolators Converting Air/Electronic Suspension to Standard Suspension; Heavy Duty; For Commercial Use; Heavy Duty Electronic to Passive Air Spring to Coil Spring Conversion Kit
2004LincolnTown CarRearIncludes (2) Springs (4) Rubber Isolators Converting Air/Electronic Suspension to Standard Suspension; Heavy Duty; For Commercial Use; Heavy Duty Electronic to Passive Air Spring to Coil Spring Conversion Kit
2004MercuryGrand MarquisRearIncludes (2) Springs (4) Rubber Isolators Converting Air/Electronic Suspension to Standard Suspension; Heavy Duty; For Commercial Use; Heavy Duty Electronic to Passive Air Spring to Coil Spring Conversion Kit
2004MercuryMarauderRearIncludes (2) Springs (4) Rubber Isolators Converting Air/Electronic Suspension to Standard Suspension; Heavy Duty; For Commercial Use; Heavy Duty Electronic to Passive Air Spring to Coil Spring Conversion Kit
2003FordCrown VictoriaRearIncludes (2) Springs (4) Rubber Isolators Converting Air/Electronic Suspension to Standard Suspension; Heavy Duty; For Commercial Use; Heavy Duty Electronic to Passive Air Spring to Coil Spring Conversion Kit
2003LincolnTown CarRearIncludes (2) Springs (4) Rubber Isolators Converting Air/Electronic Suspension to Standard Suspension; Heavy Duty; For Commercial Use; Heavy Duty Electronic to Passive Air Spring to Coil Spring Conversion Kit
2003MercuryGrand MarquisRearIncludes (2) Springs (4) Rubber Isolators Converting Air/Electronic Suspension to Standard Suspension; Heavy Duty; For Commercial Use; Heavy Duty Electronic to Passive Air Spring to Coil Spring Conversion Kit
2003MercuryMarauderRearIncludes (2) Springs (4) Rubber Isolators Converting Air/Electronic Suspension to Standard Suspension; Heavy Duty; For Commercial Use; Heavy Duty Electronic to Passive Air Spring to Coil Spring Conversion Kit
2002FordCrown VictoriaRearIncludes (2) Springs (4) Rubber Isolators Converting Air/Electronic Suspension to Standard Suspension; Heavy Duty; For Commercial Use; Heavy Duty Electronic to Passive Air Spring to Coil Spring Conversion Kit
2002LincolnTown CarRearIncludes (2) Springs (4) Rubber Isolators Converting Air/Electronic Suspension to Standard Suspension; Heavy Duty; For Commercial Use; Heavy Duty Electronic to Passive Air Spring to Coil Spring Conversion Kit
2002MercuryGrand MarquisRearIncludes (2) Springs (4) Rubber Isolators Converting Air/Electronic Suspension to Standard Suspension; Heavy Duty; For Commercial Use; Heavy Duty Electronic to Passive Air Spring to Coil Spring Conversion Kit
2001FordCrown VictoriaRearIncludes (2) Springs (4) Rubber Isolators Converting Air/Electronic Suspension to Standard Suspension; Heavy Duty; For Commercial Use; Heavy Duty Electronic to Passive Air Spring to Coil Spring Conversion Kit
2001LincolnTown CarRearIncludes (2) Springs (4) Rubber Isolators Converting Air/Electronic Suspension to Standard Suspension; Heavy Duty; For Commercial Use; Heavy Duty Electronic to Passive Air Spring to Coil Spring Conversion Kit
2001MercuryGrand MarquisRearIncludes (2) Springs (4) Rubber Isolators Converting Air/Electronic Suspension to Standard Suspension; Heavy Duty; For Commercial Use; Heavy Duty Electronic to Passive Air Spring to Coil Spring Conversion Kit
2000FordCrown VictoriaRearIncludes (2) Springs (4) Rubber Isolators Converting Air/Electronic Suspension to Standard Suspension; Heavy Duty; For Commercial Use; Heavy Duty Electronic to Passive Air Spring to Coil Spring Conversion Kit
2000LincolnTown CarRearIncludes (2) Springs (4) Rubber Isolators Converting Air/Electronic Suspension to Standard Suspension; Heavy Duty; For Commercial Use; Heavy Duty Electronic to Passive Air Spring to Coil Spring Conversion Kit
2000MercuryGrand MarquisRearIncludes (2) Springs (4) Rubber Isolators Converting Air/Electronic Suspension to Standard Suspension; Heavy Duty; For Commercial Use; Heavy Duty Electronic to Passive Air Spring to Coil Spring Conversion Kit
1999FordCrown VictoriaRearIncludes (2) Springs (4) Rubber Isolators Converting Air/Electronic Suspension to Standard Suspension; Heavy Duty; For Commercial Use; Heavy Duty Electronic to Passive Air Spring to Coil Spring Conversion Kit
1999LincolnTown CarRearIncludes (2) Springs (4) Rubber Isolators Converting Air/Electronic Suspension to Standard Suspension; Heavy Duty; For Commercial Use; Heavy Duty Electronic to Passive Air Spring to Coil Spring Conversion Kit
1999MercuryGrand MarquisRearIncludes (2) Springs (4) Rubber Isolators Converting Air/Electronic Suspension to Standard Suspension; Heavy Duty; For Commercial Use; Heavy Duty Electronic to Passive Air Spring to Coil Spring Conversion Kit
1998FordCrown VictoriaRearIncludes (2) Springs (4) Rubber Isolators Converting Air/Electronic Suspension to Standard Suspension; Heavy Duty; For Commercial Use; Heavy Duty Electronic to Passive Air Spring to Coil Spring Conversion Kit
1998LincolnTown CarRearIncludes (2) Springs (4) Rubber Isolators Converting Air/Electronic Suspension to Standard Suspension; Heavy Duty; For Commercial Use; Heavy Duty Electronic to Passive Air Spring to Coil Spring Conversion Kit
1998MercuryGrand MarquisRearIncludes (2) Springs (4) Rubber Isolators Converting Air/Electronic Suspension to Standard Suspension; Heavy Duty; For Commercial Use; Heavy Duty Electronic to Passive Air Spring to Coil Spring Conversion Kit
1997FordCrown VictoriaRearIncludes (2) Springs (4) Rubber Isolators Converting Air/Electronic Suspension to Standard Suspension; Heavy Duty; For Commercial Use; Heavy Duty Electronic to Passive Air Spring to Coil Spring Conversion Kit
1997LincolnTown CarRearIncludes (2) Springs (4) Rubber Isolators Converting Air/Electronic Suspension to Standard Suspension; Heavy Duty; For Commercial Use; Heavy Duty Electronic to Passive Air Spring to Coil Spring Conversion Kit
1997MercuryGrand MarquisRearIncludes (2) Springs (4) Rubber Isolators Converting Air/Electronic Suspension to Standard Suspension; Heavy Duty; For Commercial Use; Heavy Duty Electronic to Passive Air Spring to Coil Spring Conversion Kit
1996FordCrown VictoriaRearIncludes (2) Springs (4) Rubber Isolators Converting Air/Electronic Suspension to Standard Suspension; Heavy Duty; For Commercial Use; Heavy Duty Electronic to Passive Air Spring to Coil Spring Conversion Kit
1996LincolnTown CarRearIncludes (2) Springs (4) Rubber Isolators Converting Air/Electronic Suspension to Standard Suspension; Heavy Duty; For Commercial Use; Heavy Duty Electronic to Passive Air Spring to Coil Spring Conversion Kit
1996MercuryGrand MarquisRearIncludes (2) Springs (4) Rubber Isolators Converting Air/Electronic Suspension to Standard Suspension; Heavy Duty; For Commercial Use; Heavy Duty Electronic to Passive Air Spring to Coil Spring Conversion Kit
1995FordCrown VictoriaRearIncludes (2) Springs (4) Rubber Isolators Converting Air/Electronic Suspension to Standard Suspension; Heavy Duty; For Commercial Use; Heavy Duty Electronic to Passive Air Spring to Coil Spring Conversion Kit
1995LincolnTown CarRearIncludes (2) Springs (4) Rubber Isolators Converting Air/Electronic Suspension to Standard Suspension; Heavy Duty; For Commercial Use; Heavy Duty Electronic to Passive Air Spring to Coil Spring Conversion Kit
1995MercuryGrand MarquisRearIncludes (2) Springs (4) Rubber Isolators Converting Air/Electronic Suspension to Standard Suspension; Heavy Duty; For Commercial Use; Heavy Duty Electronic to Passive Air Spring to Coil Spring Conversion Kit
1994FordCrown VictoriaRearIncludes (2) Springs (4) Rubber Isolators Converting Air/Electronic Suspension to Standard Suspension; Heavy Duty; For Commercial Use; Heavy Duty Electronic to Passive Air Spring to Coil Spring Conversion Kit
1994LincolnTown CarRearIncludes (2) Springs (4) Rubber Isolators Converting Air/Electronic Suspension to Standard Suspension; Heavy Duty; For Commercial Use; Heavy Duty Electronic to Passive Air Spring to Coil Spring Conversion Kit
1994MercuryGrand MarquisRearIncludes (2) Springs (4) Rubber Isolators Converting Air/Electronic Suspension to Standard Suspension; Heavy Duty; For Commercial Use; Heavy Duty Electronic to Passive Air Spring to Coil Spring Conversion Kit
1993FordCrown VictoriaRearIncludes (2) Springs (4) Rubber Isolators Converting Air/Electronic Suspension to Standard Suspension; Heavy Duty; For Commercial Use; Heavy Duty Electronic to Passive Air Spring to Coil Spring Conversion Kit
1993LincolnTown CarRearIncludes (2) Springs (4) Rubber Isolators Converting Air/Electronic Suspension to Standard Suspension; Heavy Duty; For Commercial Use; Heavy Duty Electronic to Passive Air Spring to Coil Spring Conversion Kit
1993MercuryGrand MarquisRearIncludes (2) Springs (4) Rubber Isolators Converting Air/Electronic Suspension to Standard Suspension; Heavy Duty; For Commercial Use; Heavy Duty Electronic to Passive Air Spring to Coil Spring Conversion Kit
1992FordCrown VictoriaRearIncludes (2) Springs (4) Rubber Isolators Converting Air/Electronic Suspension to Standard Suspension; Heavy Duty; For Commercial Use; Heavy Duty Electronic to Passive Air Spring to Coil Spring Conversion Kit
1992LincolnTown CarRearIncludes (2) Springs (4) Rubber Isolators Converting Air/Electronic Suspension to Standard Suspension; Heavy Duty; For Commercial Use; Heavy Duty Electronic to Passive Air Spring to Coil Spring Conversion Kit
1992MercuryGrand MarquisRearIncludes (2) Springs (4) Rubber Isolators Converting Air/Electronic Suspension to Standard Suspension; Heavy Duty; For Commercial Use; Heavy Duty Electronic to Passive Air Spring to Coil Spring Conversion Kit
1991LincolnTown CarRearIncludes (2) Springs (4) Rubber Isolators Converting Air/Electronic Suspension to Standard Suspension; Heavy Duty; For Commercial Use; Heavy Duty Electronic to Passive Air Spring to Coil Spring Conversion Kit
1991MercuryGrand MarquisRearIncludes (2) Springs (4) Rubber Isolators Converting Air/Electronic Suspension to Standard Suspension; Heavy Duty; For Commercial Use; Heavy Duty Electronic to Passive Air Spring to Coil Spring Conversion Kit
1990LincolnTown CarRearIncludes (2) Springs (4) Rubber Isolators Converting Air/Electronic Suspension to Standard Suspension; Heavy Duty; For Commercial Use; Heavy Duty Electronic to Passive Air Spring to Coil Spring Conversion Kit
1990MercuryGrand MarquisRearIncludes (2) Springs (4) Rubber Isolators Converting Air/Electronic Suspension to Standard Suspension; Heavy Duty; For Commercial Use; Heavy Duty Electronic to Passive Air Spring to Coil Spring Conversion Kit
1989LincolnTown CarRearIncludes (2) Springs (4) Rubber Isolators Converting Air/Electronic Suspension to Standard Suspension; Heavy Duty; For Commercial Use; Heavy Duty Electronic to Passive Air Spring to Coil Spring Conversion Kit
1989MercuryGrand MarquisRearIncludes (2) Springs (4) Rubber Isolators Converting Air/Electronic Suspension to Standard Suspension; Heavy Duty; For Commercial Use; Heavy Duty Electronic to Passive Air Spring to Coil Spring Conversion Kit

* Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.

This part directly replaces or is cross-referenced with the following part numbers:

3U2Z18124BG3W1Z18124AA3W1Z18125CA3W7Z18124AA3W7Z18124BA3W7Z18124CA3W7Z18124GA3W7Z18125DA3W7Z18125EA3W7Z18125FA3W7Z18125GA4W1Z18124AA4W1Z18125AA4W7Z18124AA4W7Z18124BA4W7Z18124CA4W7Z18124DA4W7Z18125AA4W7Z18125BA4W7Z18125CA4W7Z18125DA6W1Z18124A6W1Z18125A6W7Z18124A6W7Z18124B6W7Z18124C6W7Z18124D6W7Z18125B6W7Z18125C6W7Z18125D7W1Z18124A7W1Z18125A7W1Z18125E7W7Z18124A7W7Z18124C7W7Z18124D7W7Z18125B7W7Z18125C7W7Z18125D8W1Z18125B9W1Z18124AAW7Z18125BABW1Z18125ABW7Z181125ABW7Z18124ABW7Z18124BBW7Z18125ABW7Z18125BE5VY18125EE5VY18125FFOAZ18125AFOAZ18125BNOT18125AVXW3Z18125AA

Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.