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Restore rear control with a fast-responding monotube damper
KYB 5550010 is a Gas-a-Just rear shock calibrated for supported 2015-2023 Ford Mustang applications without MagneRide. Its high-pressure monotube layout separates hydraulic oil from nitrogen gas for consistent response and fade resistance.
Key Features
- KYB 5550010 uses the high-pressure monotube Gas-a-Just design
- Rear driver- or passenger-side position
- Gas and oil separated by a floating piston
- Stock mounting and stock ride height
- Non-adjustable vehicle-specific valving
- Sold individually; replace axle dampers in pairs
Fitment
| Years | Make | Model | Verified Trims and Exclusions |
|---|---|---|---|
| 2015-2023 | Ford | Mustang | EcoBoost, EcoBoost Premium, GT, and GT Premium without MagneRide |
| 2015-2017 | Ford | Mustang | V6 without MagneRide |
| 2015 | Ford | Mustang | GT 50 Years Limited Edition without MagneRide |
| 2019-2020 | Ford | Mustang | Bullitt without MagneRide |
Specifications
| Detail | Value |
|---|---|
| Manufacturer Part Number | 5550010 |
| Product Line | Gas-a-Just |
| Position | Rear; left or right |
| Internal Design | Monotube |
| Gas Charged | Yes |
| Extended Length | 17.94 in |
| Compressed Length | 12.00 in |
| Quantity | One shock |
What's Included
- One KYB 5550010 rear Gas-a-Just shock absorber
- Mounting hardware shown with the exact shock
- A second shock for paired axle service is not included
About KYB
KYB engineers OE-replacement dampers around vehicle-specific valving and mounting dimensions. Gas-a-Just shocks use a high-pressure monotube layout to improve response while restoring intended ride control.
Related Parts
- Order a second identical rear shock when servicing both sides of the axle; no unrelated suspension part is linked.
FAQ
What is the 5550010?It is the exact Gas-a-Just rear monotube shock for the supported Mustang applications described in the fitment and specification tables above.
Is this sold as a complete vehicle set?The included quantity is stated in the What's Included section. Unlisted companion parts are not included.
Should fitment be checked before ordering?Yes. Confirm every listed year, model, engine, position, and exclusion before ordering.
Does installation require professional service?Professional installation is recommended when suspension geometry, exhaust alignment, or vehicle support is involved.
Can a similar part number be substituted?No. A different part number can change dimensions, contents, material, or vehicle application.
What should be inspected before installation?Inspect the mounting points, factory hardware, clearances, and every mating surface before beginning.
Does the manufacturer warranty apply?Warranty coverage follows the current manufacturer terms and requires correct installation and normal use.
What should be checked after installation?Verify security, clearance, operation, and every manufacturer-required service check before normal use.
Installation Instructions
- Confirm the Mustang year, trim, rear position, and absence of MagneRide.
- Support the vehicle safely and inspect the rear mounts, bushings, springs, and related hardware.
- Remove the original rear shock using the current Ford service sequence.
- Compare mounting dimensions and install KYB 5550010 without damaging the shaft or bushings.
- Torque all fasteners at the service-manual ride position.
- Repeat on the opposite side with a matching shock, then verify clearance and road-test carefully.
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