Whiteline Grip Series 1 Suspension Kit – 2015-2017 Ford Mustang GT

Whiteline Grip Series 1 Suspension Kit – 2015-2017 Ford Mustang GT

The Complete Handling Package for the S550 Mustang GT
Whiteline’s Grip Series 1 kit for the 2015-2017 Ford Mustang GT (S550) combines front and rear adjustable sway bars, endlinks, and performance lowering springs into a matched system engineered for the S550 IRS platform. The S550’s fully independent rear suspension responds to sway bar and spring upgrades in a way the solid-axle Mustangs couldn’t — and Whiteline has developed this kit to take full advantage of that.

DETAILS

• Adjustable front and rear sway bars
• Performance lowering springs
• Front and rear endlinks
• Matched system for S550 Ford Mustang GT
• Fitment: 2015-2017 Ford Mustang GT (S550 IRS)
• Direct bolt-on installation

S550 IRS — The Right Platform for This Kit
The S550 Mustang’s IRS is the reason this kit produces such strong results. The independent rear responds to roll stiffness calibration in a way a solid axle never could — balanced front and rear sway bars reduce body roll while maintaining rear wheel independence, producing a handling character that’s genuinely competitive with European sports cars.

Matched System Engineering
Spring rates, bar diameters, and link geometry are all matched for the S550 platform. The springs lower the center of gravity; the bars reduce roll; the endlinks ensure zero bar preload at the lowered height. All three work together rather than fighting each other.

Adjustable for Your Driving Style
Both bars are blade-adjustable, giving you a range of front-rear balance options. More rear stiffness for rotation; balanced for neutral; more front for stability. The kit’s adjustability means it adapts to your specific use case rather than forcing a single compromise.

Why Choose Whiteline

Whiteline has been engineering suspension components from their facility in Australia since 1979. Every product in their catalog is developed with a clear goal: measurable improvement in handling, stability, and tyre contact. Whiteline’s polyurethane bushings, sway bars, control arms, and alignment correction kits are engineered using finite element analysis and validated on track before they reach the market. Their components are direct-fit, bolt-on solutions designed for enthusiasts who want real performance gains without fabrication or custom work.

The RallySport Take

The most complete single-purchase suspension upgrade for the S550 Mustang GT. Matched, validated, and built specifically for the IRS platform. Plan for an alignment after installation since the lowering springs will change the geometry readings. Run the sway bars at matched middle positions first and adjust from there based on how the car responds. This kit is the most efficient way to spend money on a suspension upgrade — four components addressed at once rather than individually sourced over multiple purchases.

What’s in the Box

• Adjustable front and rear sway bars
• Performance lowering springs
• Front and rear endlinks
• Matched system for S550 Ford Mustang GT

Fitment