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How to Install ST Suspension Coil Over Kit on your Mustang

Installation Time

4 hours

American Muscle
Shop Parts in this Guide


Before you start to install, please read the following instructions carefully:

- The suspension components must match the suspension application specifications (springs and shocks/struts identification numbers).

- The instructions must be followed !


• You must read the General Installation instructions, as well as the Technical Data documents carefully BEFORE attempting installation.

• The suspension components may only be installed by a properly trained technician using the proper tools.

• Always use the appropriate tools and safety equipment for each step to prevent any serious bodily harm or injury.

• Never use impact wrenches or guns to install or remove shock absorber piston hardware.

• Please take care that all attachment points of the suspension (for example: fittings of shock absorber housings or fittings of the lower control arm in the housing of the wheel bearing) are free of dust and oil. (see manufacturers guidelines).

CAUTION: Danger of explosion!! Never disassemble or cut open shock absorbers and/or shock absorber inserts. They contain oil under pressure.

• The electronic suspension control (when applicable) needs to be disabled through an authorized dealer.

• We recommend the use of a vehicle hoist or lift when installing the suspension. If a lift is not available and jacking equipment is used, make sure that the vehicle is secured with commercial wheel blocks and jack stands to ensure safety.

General Instructions for Use:

• When adjusting the vehicles height, make sure that the threads are clean and free of debris. After initial cleaning, move the perch downwards by 10 mm (0.4 Inches), and then clean the area that you desire to adjust the perch to (up or down).

• During height adjustments on separate shock and spring systems, remove the perch from the vehicle to adjust the height.

• The piston rod and the piston seal of the new and used damper may have oil and grease. This could either be caused by using special black grease during assembly or excess assembly oil. Furthermore, oil is used during assembly of the cartridge and rod guide. If dust and dirt has accumulated in these areas, there is no need to be worried about damage.


This assembly guideline is protected by copyright law. This assembly guideline is subject to a right to download and print the guideline which we grant for the purpose of the installation of products that have been purchased from us. Further reproduction is not allowed. Any devolution or sub-licensing of this copyright to a third party as well as any manipulation of the photographs is not allowed. We are entitled to cancel the granted copyright at any time. Copyright violations will be prosecuted.

General Mounting Specifications:

1. We recommend the use of a vehicle hoist or lift when installing the suspension.

2. Caution: If the vehicle is equipped with ride height sensors, they should be removed before removal of struts or dampers, otherwise damage may occur. Disconnect the battery anytime any electrical parts are removed.

3. The struts should be removed as specified by manufacturer’s instructions.

4. Manufacturer recommended tools for removal of the original struts, or a suitable spring compressor, has to be used in order to remove factory mounted suspension systems.

5. Mount the complete suspension system as described on the following pages.

6. Never use impact drivers to install nuts on the piston rods as permanent damage may occur. It is imperative that you do not damage the piston rod surface, such as use of pliers, as the smallest damage will result in seal damage, and will not be covered under warranty.

7. Ensure that the set screw on each spring collar is tightened to prevent movement of the spring perch. On vehicles with separate shock/spring combinations, a set screw is not necessary. Caution: Do not over tighten the set screw. Maximum torque is 1 - 2 Nm (0.74-1.47 ft-lb).

8. Install the suspension components to the vehicle as specified by the vehicle manufacturer in their factory service manual.

9. Except as noted, all torque values must comply with manufacturer recommended specifications.

10. After assembly and installation is complete, the vehicle should be rolled onto level ground. Once on level ground, measure the vehicle height and adjust to the customer’s requirements, within the prescribed lowering range. Caution: It is possible that the vehicle suspensions will settle down for an additional 5 - 10 mm (0.2 - 0.4 Inches)

11. Examine the clearance between the tires and the suspension over the full range of motion of the wheel. The minimum clearance between the suspension and the tire is 5 mm (0.2 Inches). If this clearance is less than 5 mm (0.2 Inches), wheel spacers may be necessary. With strut designs which are located close to the wheel, but which don´t have steering functions, place 100 mm (3.9 Inches) spacers underneath diagonally opposed tires (e.g. front right and rear left). In this position, you have to be able to achieve the minimum clearance required. You can also check the clearance between tire and body. Caution: Wheel hub center to wheel arch minimum and maximum measurement found in the installation documents may not be exceeded! Also take into account minimum road clearances as specified by local & state laws. Caution: With torsion beam trailing arm axles, this method is not sufficient. The vehicle has to be fully loaded test driven to properly calculate the clearances of 5 mm (0.2 Inches) from any other components.

12. The alignment of the suspension needs to be adjusted according the specifications of the vehicle manufacturer by a properly trained technician. If a value cannot be reached due to the difference in the height, an optimal value next to the tolerance range of the specifications should to be adjusted to.

13. All components that are controlled by vehicle ride height (e.g. headlights, brake bias regulator etc.) have to be adjusted as specified by the vehicle manufacturer instructions and procedures.

14. For vehicles with ESP, DSC or EPC your new suspension components may cause an engine fault code to appear. This is only temporary as the vehicle electronics adjust to the new components/ height. On some models this will end after driving approximately 3-5 miles, or through turning the steering wheel from full left to full right. On newer models, this must be reset through the factory diagnostic port by a qualified technician.

15. After you have completed installation of the suspension, check the clearance of the tires to the front suspension struts. The minimum clearance at the narrowest point is 5mm, please use wheels spacers if necessary.

Calculating the adjustment range (distance measurement A) : (Photos are examples only)

Please enter the adjusted height of the modified car into the list:

* IMPORTANT: The allowable measurement between wheel hub center and fender edge as indicated above, may not exceed these measurements when using standard fenders.

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