How to Upgrade Your Fox Body Struts to Coilovers

Not long ago, a front coilover conversion was the calling card of any Fox Body built for serious work, whether it was chasing times at the drag strip or carving cones at the autocross. Now, Steeda has revived and refined that proven setup. With the return of our Pro-Action shocks and struts for every 1979-2004 Mustang, the Steeda Mustang Front Coilover Kit (MPN 555-8110) is back in production, machined from billet aluminum in our Valdosta, Georgia, shop.

This isn’t just a throwback to the kits we offered in the 90s and early 2000s. The bar for fitment and machining has been raised, and this kit is built to meet it. Here’s what’s changed, why a coilover conversion still makes sense for your Fox Body or SN95/New Edge Mustang, and what you need to know before bolting one on.

---

Why Convert Your Fox Body to Front Coilovers

The argument for a front coilover conversion boils down to three things: shedding weight, dialing in ride height through adjustability, and unlocking spring flexibility.

A standard front lowering spring for a Fox Body tips the scales at nearly 15 pounds. Swap in a full coilover setup with a 2.5-inch spring, and you’re carrying less than half that up front, right where every pound counts. Dropping mass from the nose lets the suspension react quicker, whether you’re hunting for a better 60-foot or looking for more bite at corner exit.

Adjustability is the other side of the coin. Instead of swapping springs to tweak ride height, a threaded coilover sleeve on each strut lets you fine-tune it with a spanner wrench. Pair that with adjustable rear hardware, and you can dial in stance and corner weights at every corner until the car sits and handles exactly how you want.

Moving the spring from the lower control arm up to the strut changes the front suspension’s motion ratio. Now, the spring sits closer to the wheel and gets more done with less effort. Where you might have needed an 800-pound competition spring in the stock spot, you can run a much softer rate on a coilover and still keep the front end in check. That’s why this kit’s spring options run from 125 to 250 pounds, numbers that might look low if you’re used to conventional front springs.

---

What Changed for the New Kit

Military Grade Hard Coat Anodizing

Each sleeve and perch is carved from billet aluminum and finished in a natural tone with military-grade hard-coat anodizing. That finish does more than fend off corrosion; it hardens the surface and reduces friction on the threads, so the adjustment collars spin smoothly and withstand countless ride-height tweaks.

Tighter Tolerances, No More Strut Tube Trimming

If you ever tackled a coilover kit on a Fox Body years ago, you probably remember the hassle of cutting or snapping off the flared lip at the top of the strut tube where the factory bump stop sat. The new kit skips that headache. We use thicker wall material and machine the sleeve to tight specs, so it slides over the strut tube and locks down with zero side-to-side play. The bottom of the sleeve is notched for perfect alignment. Paired with our Steeda front struts, it’s a true bolt-on, no mods needed, and it fits most other compatible struts tighter than anything from back in the day.

A Sealed Torrington-Type Roller Bearing, Not Loose Shims

Every time you turn the wheel, the strut assembly pivots, and so does the spring. Most kits use a bare roller bearing and a stack of shims on the upper perch. Steeda takes it further, machining a groove into the two-piece upper perch for rubber O-rings, then sealing the whole assembly with a cap. The Torrington-type roller bearing inside lets the spring spin smoothly under load, while the seal keeps out dirt and grit. The payoff is steering that stays quiet and consistent, lap after lap.

A Nylon-Tipped Set Screw That Protects Your Threads

Cranking down ride height with a bare steel set screw will eventually chew up the threads on your coilover sleeve, making future adjustments a pain or even impossible. This kit solves that with a nylon-tipped set screw on the adjustment collar. It locks things down tight against vibration but leaves the threads untouched, so you can tweak ride height as often as you want. Just loosen the screw, spin the collar with the included wrench, and lock it back in place.

---

Spring Selection: Drag, Handling, and Street

The sleeve gives you up to 6 inches of adjustment range. That doesn’t mean you can slam the car 6 inches; it means the kit is built to handle a wide range of spring lengths and rates so that you can tailor the setup to your exact combo.

If you’re building for drag racing, you’ll want a longer spring, usually 12 to 14 inches, to help the front end separate and transfer weight at launch. If handling is your game, a shorter, stiffer spring keeps body motion in check. Steeda offers front spring pairs for this kit, ranging from a 14-inch, 125-pound spring to a 12-inch, 250-pound spring, with recommendations based on your car’s front-end weight.

Spring	Recommended For
14in 125lb / 12in 175lb (lighter rates)	Lightened cars with lightweight K-members, fiberglass hoods, aluminum heads
12in 175lb	Minimal front weight reduction, or 351W with aluminum heads
12in 200lb	Stock or slightly heavier than stock front end weight
12in 225lb / 12in 250lb	Heavier combinations and firmer handling setups

Springs are sold separately. Because motion ratio, front-end weight, and intended use all factor into the correct rate, call or email Steeda’s sales team before ordering so we can spec the right spring for your package.

Why a Strut Tower Brace Is Mandatory

Ford engineered the Fox Body’s front suspension with the spring seated on the lower control arm, loading into a K-member pocket that feeds those forces down the front frame rails. That architecture keeps spring loads away from the strut towers, and the towers were sized accordingly.

With a coilover conversion, the spring moves to the strut assembly, so the strut towers now carry the weight of the car’s nose. On any street- or track-driven Fox Body or New Edge, a Steeda strut tower brace isn’t just a nice upgrade; it’s a must. The brace links the towers and spreads those loads across the front of the car and back to the firewall, cutting chassis flex so the suspension can work as designed. The result is a smoother ride and more predictable handling when you lean on the car.

Finishing the Stance: Weight Jacker Rear Control Arms

Adjustable front ride height is just half the story. Steeda’s Weight Jacker adjustable lower control arms bring that same threaded adjustability to the rear. With coilovers up front and Weight Jackers out back, you get ride height control at all four corners, making it easy to level the car, set your rake, and fine-tune corner weights.

Installation Notes

Installation is a bit more involved and should take about three hours with basic shop tools. Here are a few key things to keep in mind:

• Spacer orientation matters. Refer to the included instructions for the correct spacer arrangement on your particular caster/camber plate. The lower the ride height, the more spacers go on top of the plate to preserve shock travel and keep the strut from contacting itself at full compression.
• Torque the strut-to-spindle nuts to 140 ft-lbs after reattaching the ABS bracket.
• Torque the top strut nut to 60 ft-lbs, and do not use an impact. Steeda offers the proper strut nut tools to make this step easier.
• Setting ride height is straightforward: drop the included spanner wrench into the threaded collar, raise or lower the car to your liking, and snug up the nylon-tipped set screw. Just don’t overtighten it.

Fitment and Compatibility

The 555-8110 kit bolts onto any 1979-2004 Mustang: LX, GT, Cobra, Mach 1, Bullitt, or SVO. It takes standard 2.5-inch coilover springs and can be reversed back to stock springs if you ever want to go back.

Compatible struts include Steeda Pro-Action, Tokico Illumina and D-Spec, Strange adjustable, Koni Sport (single- and double-adjustable), and Lakewood units with a 2.2-inch housing. The kit won’t fit QA1, Koni STR.T, Bilstein, or Lakewood 2.0-inch housing struts.

Final Thoughts

The Fox Body front coilover conversion built its reputation years ago, and this kit brings it up to date where it matters: a tougher, slicker anodized finish, tight machining that eliminates strut tube mods, a sealed roller-bearing perch for smooth, quiet steering, and ride-height locking that won’t chew up threads. Built in Valdosta, Georgia, and backed by decades of Steeda race engineering, it’s the perfect match for our Pro-Action struts and Weight Jacker rear control arms, giving you adjustability at every corner of your 1979-2004 Mustang.