X350 X358 Air to Coil Spring Suspension Conversion Kit

Key Features:
  • Saves You Money Compared To OEM/Dealer Prices
  • Installation Instructions Included
  • Regain The New Car Feel
  • No Sacrifice Of Ride height Or Quality
  • Improve Consistency Of Carry Load
  • Reduce Your Vehicle Down Time

Order Includes:
Order Includes: 2 Front Quick Complete Struts, 2 Rear Quick Complete Struts, Bypass Module

Out Of Stock
Part Number 117J-31-4
Condition New
Ships Within 1-2 Business Days
This item qualifies for FREE UPS Ground Shipping
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Suncore’s Front and Rear Air Spring to Coil Spring Conversion Kit Part 117J-31-4 for your Super V8, Vanden Plas, XJ or XJ8 is the perfect upgrade for an aged and failing air suspension system. Our air to coil spring conversion kits are brand new and built to give your Super V8, Vanden Plas, XJ or XJ8 a more reliable suspension system.
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Cardone New: 4J-7000K
Arnott Industries: C-2745
Product Grade
Special Note
Engineered for a Superior Fit and Trouble-Free Installation
Product Grade
Special Note
Engineered for a Superior Fit and Trouble-Free Installation


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
4 total ratings
Verified Buyer
This is a very cost effective alternative to the air suspension takes a little while to settle down on the new springs but great for the price
Reviewed on 11/24/2020
Verified Buyer
Excellent conversion kit for Jaguar. The ride is great and the car sits at a good ride height. Highly recommend!
Reviewed on 11/13/2020
Verified Buyer
Good product very satisfied and affordable
Reviewed on 9/23/2020
Verified Buyer
Great product, price and service.
Reviewed on 9/18/2020
Showing comments 1-4 of 4

X350 X358 Air to Coil Spring Suspension Conversion Kit

Where can I purchase the warning light removeable module for my 2004 jaguar XJ8?

Customer Service

Unfortunately we do not carry the light removal tool at this time. You may be able to purchase this tool from other online vendors.

I was reading the above message. If I buy the strut set, it does come with the light removal tool correct?

does the light removeable module come for my 2006 vanden plas