Ride Height Drop
Designed to maintain proper suspension geometry while significantly improving appearance.
| Position | Ride Height Drop |
|---|---|
| Front | 1.0 inch |
| Rear | 1.0 inch |
A balanced one-inch drop gives the Mustang a more muscular stance while preserving practical street clearance for daily driving.
Spring Rates
The progressive spring rates improve handling without making the ride overly harsh.
| Position | Spring Rate |
| Front | 185-275 lb/in |
| Rear | 800-880 lb/in |
The higher rear spring rate helps control rear-end squat during hard acceleration while improving chassis stability during spirited driving.
Premium Chrome Silicon Spring Steel Construction
Unlike lower-quality suspension springs that may fatigue over time, AJP Distributors uses SAE 9254 chrome silicon high-tensile spring steel to deliver long-term durability and consistent ride height.
Construction highlights include:
- SAE 9254 chrome silicon spring steel
- High-tensile spring wire
- CNC cold-wound manufacturing
- Heat-treated construction
- Industrial-grade powder-coated finish
- Corrosion-resistant coating
- OEM-quality manufacturing standards
The combination of cold winding and heat treatment helps resist spring sag while maintaining predictable suspension performance throughout the life of the vehicle.
Improve S550 Mustang Handling
The factory S550 Mustang suspension provides an excellent balance between comfort and performance, but lowering the vehicle further enhances its capabilities.
Benefits include:
- Reduced body roll
- Improved steering response
- Lower center of gravity
- Better cornering grip
- Reduced brake dive
- Reduced rear squat during acceleration
- More planted highway stability
- Improved weight transfer
- Aggressive performance appearance
Whether you’re driving an EcoBoost daily or enjoying weekend canyon roads in a GT, these improvements are immediately noticeable.
Designed for OEM or Aftermarket Shocks
These lowering springs are engineered for compatibility with:
- Factory OEM struts
- Factory OEM shocks
- Performance replacement dampers
- Adjustable aftermarket suspension
Although compatible with factory dampers, performance shocks can further improve ride control and suspension response.
Durable Powder-Coated Finish
Each spring receives an industrial-grade powder-coated blue finish that protects against:
- Road salt
- Moisture
- Rust
- Corrosion
- Stone chips
- Everyday road debris
The finish helps preserve the appearance and longevity of the suspension even in challenging weather conditions.
Installation Information
Estimated Installation Time
2-4 hours
Professional installation is strongly recommended.
Following installation:
- Perform a professional four-wheel alignment.
- Inspect factory struts and suspension bushings.
- Verify bump stop condition.
- Re-torque suspension components after initial break-in.
An alignment is highly recommended after lowering to maximize tire life and maintain proper handling characteristics.
Technical Specifications
| Specification | Details |
| Brand | AJP Distributors |
| Platform | Ford Mustang S550 |
| Material | SAE 9254 Chrome Silicon High-Tensile Steel |
| Manufacturing | CNC Cold-Wound |
| Heat Treated | Yes |
| Finish | Industrial Powder Coat (Blue) |
| Front Drop | 1.0 in |
| Rear Drop | 1.0 in |
| Front Spring Rate | 185-275 lb/in |
| Rear Spring Rate | 800-880 lb/in |
| OEM Shock Compatible | Yes |
| Aftermarket Shock Compatible | Yes |
| MagneRide Compatible | No |
| GT350 Compatible | No |
| GT500 Compatible | No |
| Warranty | Manufacturer Warranty |
Frequently Asked Questions
Will these fit my 2020 Mustang GT?
Yes. These springs fit the 2015-2021 Mustang GT equipped with the standard suspension.
Will these work on an EcoBoost Mustang?
Yes. EcoBoost models from 2015-2021 are compatible.
Do these fit MagneRide-equipped Mustangs?
No. Vehicles equipped with MagneRide suspension require springs specifically designed for that suspension system.
Will these fit a GT350 or GT500?
No. Shelby GT350 and GT500 models use different suspension components and are not compatible.
Can I use factory shocks?
Yes. These springs are designed to work with OEM shocks and struts, although upgraded dampers are recommended for maximum performance.
Is an alignment required?
Yes. A professional alignment should always be performed after changing ride height to ensure proper suspension geometry and tire wear.
Why Buy From Pro Street Online?
At Pro Street Online, we know suspension upgrades are about more than just lowering a car—they’re about building a Mustang that drives as well as it looks. We offer genuine performance parts, fast shipping, and expert fitment support to help you choose the right suspension components for your S550 build.
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