Lowering Springs for the Ford Mustang

Ford has sold six distinct Mustang chassis since 1979, and lowering spring part numbers follow those chassis breaks, not just the GT badge. The table below lines up each generation with the Eibach Pro-Kit part built for it.

The 3510.140 kit covers both the Fox Body and SN95/New Edge V8 cars, including the 1994-1998 Cobra and the 1999-2004 V6 convertible, but it does not fit the 1999-2004 Cobra's independent rear suspension. If your car needs something other than a fixed-drop spring for that IRS Cobra, a Mustang coilover kit gives per-corner adjustment instead.

Drop amounts on a Mustang vary more by generation and trim than on most other platforms, mainly because the GT, V6/EcoBoost, and Boss 302 all run different factory spring rates:

• Fox Body and SN95/New Edge (3510.140): about 1.5 inches front and rear.
• 2005-2010 GT/Bullitt (35101.140): 1.3 inches front, 1.4 inches rear.
• 2011-2014 GT (35125.140): 1.0 inches front, 1.5 inches rear; V6 and Boss 302 drop less on the same part number.
• 2015-2023 S550 GT without MagneRide (35145.140): 1.0-1.1 inches front and rear.
• 2024+ S650 GT without MagneRide (35145.140): about 1.3 inches front and rear.

None of these Pro-Kit numbers fit a GT or Dark Horse built with factory MagneRide dampers; that trim needs a MagneRide-specific spring, and pairing the wrong kit with MagneRide shocks is a common fitment mistake. For a wider drop range than a fixed spring can give, see coilovers vs. lowering springs.

Any drop in this range moves the control arm and strut geometry enough to pull in negative camber and shift toe, so plan on a four-wheel alignment right after install rather than just checking toe. Lowering also closes up the gap between tire and fender, which matters most on cars already running wider wheels or a staggered setup; check full steering lock and full suspension compression before calling the install finished.

Installation itself is a bolt-in spring swap on struts and shocks that are already off the car, so most owners budget it alongside a lowering springs install and cost breakdown whether they're paying a shop or doing it with a home spring compressor.

A spring-only kit like the Pro-Kit swaps onto the stock struts and shocks and is the cheapest way to drop a Mustang, but the ride height and damping are fixed once it's installed. A lowering kit adds matched shocks for a more controlled ride at that same drop, and a coilover setup lets you dial ride height, and often rebound, per corner across every generation. Eibach is one of several brands making Mustang-specific springs; compare specs on the Eibach and lowering springs by car pages before choosing a kit for your exact year and trim.