Rear Air to Coil & Shock Conversion Kit 03-11 Crown Vic Grand Marquis & Town Car

Key Features:
  • Limited Lifetime Warranty
  • Saves You Money Compared To OEM/Dealer Prices
  • Installation Instructions Included
  • Brand NEW

Order Includes:
Order Includes: 2 Rear Shocks, 2 Rear Heavy Duty Coil Springs, 4 Insulators

Out Of Stock
Part Number 45F-30-HD-KIT
Condition New
Ships Within 1-2 Business Days
This item qualifies for FREE UPS Ground Shipping
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Suncore’s Rear Air Spring to Coil Spring Conversion Kit Part 45F-30-HD-KIT for your Crown Victoria, Grand Marquis or Town Car is the perfect upgrade for an aged and failing air suspension system.
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Special Note
Low Cost Alternative To Air Suspension
Max Year Covered
Min Year Covered
Most Popular Make / Model
Ford Crown Victoria
Most Popular Year
Product Grade
Total Part VIO
Max Year Covered
Most Popular Make / Model
Mercury Grand Marquis
Product Grade
Min Year Covered
Most Popular Year
Special Note
Nitrogen Gas Charged For Superior Response and Consistent Control
Total Part VIO
Extended Length
Compressed Length
Travel Length
This kit will keep the car at factory height while providing a smooth car ride. You will be saving Time and Money by purchasing this complete kit. The Town Car conversion kit will eliminate the air suspension problem forever. How to disable the air suspension light is provided in the instructions. Gas Shocks should be replaced every 50,000 miles and are included with this kit. For safety reasons your Gas Shocks should be maintained for these periods. This kit comes with a **Limited Lifetime Warranty** against any manufacturer defects and included with your purchase you will find easy to follow installation instructions.


Suncore Industries was established in 2000 and have been a member of the Automotive Parts Rebuilders Association (APRA) ever since. Our mission began with rebuilding air suspension components and moved quickly into offering better solutions with conventional suspension conversion kits to give our customers the longevity they can rely on.

The most common reason for an air strut failure is due to dry rotting of the air bag. This is something that happens over time, the air bag starts to deteriorate and causes leaks, when this happens the air bag can no longer hold air pressure. A leaking air bag can cause the strut it fits over to fail as well. The second factor of an air strut failure is the strut itself. The strut is pressurized with fluid, and if the strut begins to fail it will no longer have the same pressure to hold the vehicle. If this system begins to fail one visible sign will be that your vehicle will be lower than factory height. If Air Struts are not replaced on time, it will cause an Air Suspension Compressor Failure.

We are happy to offer free UPS ground shipping on all orders to the lower 48 States.

Unfortunately since these parts are quite heavy and large we cannot offer free shipping to Puerto Rico, Hawaii nor Alaska. (We do offer shipping to these areas, but it will be based upon UPS quotations. Please feel free to contact us directly.)

We do not ship to P.O. Boxes nor APO's as UPS will not deliver to these locations.

If you would prefer a different or expedited shipping option, please contact us and we will be glad to work around your needs.

Business hours are Monday to Friday 9am to 5pm EST.

We ship UPS Ground by default
Same-day shipping will be provided for orders placed before 2PM EST
Orders after 2PM EST will be shipped the next business day
Orders on the weekend will be shipped the next business day
Orders on a holiday will be shipped the next business day
Tracking will be provided immediately to the email provided in your order
Signature required is mandatory on any order over $400
Signature required may be requested on orders below $400

Complete strut assembly free shipping ups ground
Please refer to this chart for estimated transit times. We are shipping out of the warehouse in Boynton Beach, Florida zip code 33426

5 out of 5 stars
1 total ratings
Verified Buyer
Works exactly as described. Good quality product. Pleased with the result.
Reviewed on 9/24/2020
Showing comments 1-1 of 1

Rear Air to Coil & Shock Conversion Kit 03-11 Crown Vic Grand Marquis & Town Car

Is the duty springs really the best

Customer Service

Hi Tiara, thank you for reaching out. The HD springs are going to be a little more stiff and will raise your vehicle a little higher as well. I would recommend going with standard unless you typically have a heavier load in the rear of the vehicle. Please let us know if you have any further questions. -Stephanie

I keep alot of my workout equipment (weights sled, etc. in my trunk of my car... heavy duty springs well help my car stay level