Why Eibach is the spring authority for both Mustangs and trucks

Three reasons. First, spring engineering: Eibach is, before anything else, a spring company. Their progressive-rate spring technology means the spring rate varies as it compresses, soft at small inputs (street comfort) and firmer at big inputs (control under load). This applies equally to a Mustang Pro-Kit lowering spring and a Pro-Truck lift spring. Second, OEM partnerships: Eibach supplies springs to Porsche, BMW, Mercedes, Audi, and Ford Performance. The engineering rigor that goes into a 911 GT3 spring also goes into a Pro-Kit Mustang spring and a Pro-Truck F-150 spring. Third, system tuning: Eibach pairs every spring with a damper engineered specifically for that spring rate. You are not picking a spring and a shock separately and hoping they work together.

Eibach for Mustang, Focus ST/RS, Fiesta ST, and Maverick

Eibach's performance car catalog is one of the deepest in the aftermarket. The lineup is built around three spring tiers (Pro-Kit, Sportline, Drag Launch) plus matched dampers, sway bars, camber bolts, and wheel spacers. Here is how the lineup breaks down.

Pro-Kit Lowering Springs

The volume seller. Pro-Kit drops the car roughly 1 inch in the front and 1 inch in the rear (varies slightly by platform), retaining factory ride quality with significantly improved handling, reduced body roll, and a more aggressive stance. Pro-Kit uses Eibach's progressive-rate technology, which means the car rides softer over broken pavement than a comparable linear-rate spring at the same drop. Available for Mustang (every generation), Focus ST, Focus RS, Fiesta ST, GT500, Maverick, and SVT Cobra. The right pick for daily-driven performance cars.

Sportline Lowering Springs

The aggressive sibling to Pro-Kit. Sportline drops the car roughly 1.5 inches front and rear, gives a more aggressive stance, and tunes the spring rate slightly stiffer for track-day duty. Sportline rides firmer than Pro-Kit, the trade-off for the more aggressive look and better high-speed stability. Available for Mustang GT, Mustang EcoBoost, GT500, and select Focus ST applications.

Pro-Plus and Sport-Plus Suspension Kits

Pro-Plus is Pro-Kit springs paired with matched front and rear sway bars (anti-roll bars). Sport-Plus is Sportline springs paired with the same sway bars. Both kits address body roll directly, which is where Mustangs and Focus STs feel most "soft" from the factory. The sway bar pairing is the upgrade most owners do not realize they need until they install one. Pro-Plus is the daily-driven track-curious package. Sport-Plus is the more aggressive track-day setup.

Pro-Damper Shocks and Struts

Eibach Pro-Damper is a complete front-and-rear damper kit engineered specifically to pair with Pro-Kit or Sportline springs. Stock dampers are valved for stock springs and quickly become the limiting factor when you upgrade springs. Pro-Damper restores damping authority and dramatically extends the life of the lowered setup. If you are running Pro-Kit or Sportline springs on tired factory shocks, Pro-Damper is the next upgrade.

Anti-Roll Sway Bars

Eibach's tubular performance sway bars are sold as front-only, rear-only, or front-plus-rear kits. Reduces body roll, sharpens turn-in, and improves on-throttle stability. Available for Mustang (all generations), Focus ST, Focus RS, Fiesta ST, and Mustang GT500. The single most cost-effective handling upgrade for any performance Ford.

Pro-Spacer Wheel Spacer System

Bolt-on hub-centric wheel spacers in 15mm, 20mm, 25mm, 30mm, and 35mm widths. Push the wheels out for a wider, more aggressive stance and to clear bigger brake calipers. Available for Mustang and Focus ST/RS in matching front-and-rear pairs. Pro-Spacer uses precision-machined billet aluminum and includes longer wheel studs.

Pro-Alignment Camber Bolts and Arms

Lowering a car puts camber out of spec. Eibach's Pro-Alignment 14mm camber bolts (Mustang) and camber arm kits (Focus ST) restore proper alignment after lowering. Required if you are running Pro-Kit or Sportline springs and want clean tire wear.

Eibach Pro-Truck Suspension for F-150, Super Duty, Tacoma, Bronco, and Ram

Eibach's truck lineup, Pro-Truck, brings the same German engineering and progressive-rate spring philosophy to lifted trucks. The lineup is comfort-biased, the ride quality of a properly matched Eibach Pro-Truck kit is widely considered the most plush, OE-feel option in the truck aftermarket.

Pro-Truck Sport (entry tier)

Eibach's entry shock-and-spring upgrade. Pro-Truck Sport front shocks have integrated leveling capability that lifts the front 1.5 to 2 inches without a separate spacer. Matched rear shocks are tuned for the platform. Direct competition for the Bilstein 5100 series, with one important difference: Eibach pairs progressive-rate front coil springs in many fitments where Bilstein leans on factory springs. The result is a noticeably plusher ride versus the 5100 setup at a similar price.

Pro-Truck Stage 1 (front + rear shock package)

Complete front and rear shock package, often with progressive-rate Pro-Lift-Kit springs paired in. Sits between Pro-Truck Sport and the Stage 2 coilover. Stage 1 is the right pick for owners who want a complete suspension upgrade at a moderate budget.

Pro-Truck Stage 2 (front coilover)

Swaps the front Pro-Truck Sport shock for a true threaded coilover with adjustable spring perch height. Gives ride-height precision (1.5, 2, or 2.5 inches of front lift) and refined damping. Pair with rear Pro-Truck shocks for a complete kit.

Pro-Truck Stage 2R (with remote reservoir)

Stage 2 coilover plus a remote reservoir for additional oil volume and better heat dissipation. Stage 2R is Eibach's most off-road-capable Pro-Truck product, though it is still comfort-biased compared to Fox 2.5 Performance Elite or ICON 2.5 VS RR.

Pro-Truck Stage 3R (full coilover front and rear)

Eibach's top tier on select platforms (currently the 2015-2026 F-150). Stage 3R is a full front-and-rear reservoir coilover system with 1 to 3 inches of lift. Top-of-line Eibach truck setup.

Pro-Lift-Kit Springs

Progressive-rate truck springs sold separately for owners who want to lift on factory or aftermarket shocks. Cost-effective entry to Eibach feel without a full kit, but you compromise on shock matching.

Pro-Alignment Front UCA Kit

Eibach also makes upper control arms for Tacoma and Bronco that restore proper geometry on lifted trucks. Comparable in spec to ICON Tubular Delta Joint UCAs.

Eibach progressive-rate spring technology explained

This is the single most important thing to understand about Eibach. A linear-rate coil spring has the same spring rate regardless of how much it is compressed. A progressive-rate spring has variable rate, soft at low compression (small bumps) and progressively firmer at high compression (big impacts). The result is a ride that feels noticeably softer over broken pavement and small bumps but firms up automatically when you load the suspension or hit a serious dip.

Why does this matter? Two reasons. First, comfort: a daily driver running progressive-rate springs has a better street ride than the same vehicle running linear-rate springs at the same drop or lift height. Second, capacity: a progressive-rate spring handles a wider range of loads (empty truck vs. towing, solo driver vs. four passengers) without sagging or topping out. Eibach has been refining progressive-rate spring engineering since the 1950s.

The trade-off is that progressive-rate springs are more expensive to manufacture (precision wire-tapering and heat treatment) and pickier about damper pairing. This is why most Eibach kits are sold as matched systems rather than as individual parts.

Best Eibach setup by vehicle

Mustang (1979-2025, all engines)

Eibach is the volume lowering spring brand for Mustang. Pro-Kit (1 inch drop) is the daily driver pick. Sportline (1.5 inch drop) is for owners who want a more aggressive stance and stiffer feel. Pro-Plus (Pro-Kit plus front and rear sway bars) is the value upgrade for serious handling. Pro-Damper shocks are the right next step if you are upgrading from tired factory dampers. Pro-Alignment camber bolts are required after lowering. Eibach has fitments for every Mustang generation from Fox Body (1979-1993) through current S650 (2024-2025), gas and supercharged, V6 and V8 and EcoBoost.

Focus ST and Focus RS (2013-2019)

Eibach's Focus catalog is comprehensive: Pro-Kit lowering springs, Sportline aggressive lowering, Pro-Plus spring-and-sway-bar combos, Pro-Damper shocks, Anti-Roll sway bars (front, rear, or pair), Pro-Alignment camber arm kit, and Pro-Spacer wheel spacers in 15mm-35mm widths. Most Focus ST and RS owners start with Pro-Kit, add the matching front and rear sway bars within a year, and step up to Pro-Damper when factory shocks tire out.

Fiesta ST (2014-2019)

Pro-Kit lowering springs are the volume Fiesta ST upgrade. Pro-Plus pairs the spring with front and rear sway bars. Anti-Roll single-bar kits are also available for owners who only want one or the other.

Ford Maverick (2022-2026)

Eibach makes Pro-Kit lowering springs (FWD and AWD versions) and Pro-Lift-Kit springs for the Maverick. The Maverick lineup is unusual because the platform supports both lowering (Pro-Kit) for street-priority owners and lifting (Pro-Lift-Kit) for owners using the Maverick as a small adventure rig.

Ford F-150 (2009-2014, 2015-2020, 2021-2026)

F-150 is one of Eibach's deepest truck platforms. Pro-Truck Sport is the volume entry pick for a 1.5 to 2 inch leveled stance. Pro-Truck Stage 1 adds matched rear shocks. Stage 2 adds the threaded front coilover. Stage 2R adds the remote reservoir. The 2015-2026 F-150 also gets the Stage 3R full front-and-rear coilover system. Most F-150 customers buying Eibach specifically want a comfort-first daily driver setup, and Stage 1 is the sweet spot.

Ford Raptor (2010-2014, 2017-2020, 2021-2026)

Raptor came with Fox from the factory. Eibach's Raptor offering centers on Pro-Lift-Kit springs (front and rear) for owners who want to add lift to their factory Fox setup. Eibach makes 1.1 inch and 2.5 inch front spring options for the 2023+ Raptor R and 2.2 inch springs for the 2021+ standard Raptor.

Ford Super Duty F-250 / F-350 (2005-2016, 2017-2026)

Super Duty Eibach support centers on Pro-Truck Sport and Stage 1 packages with platform-specific spring rates. Heavier truck means stiffer spring rates. Super Duty owners also get the Eibach steering stabilizer for 6.7L Powerstroke trucks.

Ford Ranger (2019-2023, 2024-2026)

The 2019-2023 Ranger has solid Eibach Pro-Truck Sport, Stage 1, Stage 2, and Stage 2R support. The new 2024+ Ranger 2.3L has dedicated Stage 2 and Stage 2R coilover lift kits, plus Pro-Truck 2.0 coilovers and rear reservoir shocks.

Ford Bronco (2021-2026)

Bronco gets Pro-Truck Stage 2 coilover packages, HD coil springs (front and rear) for owners running heavier accessories, and a Pro-Alignment UCA kit. The Bronco's chassis weight and use case (mix of overlanding and daily driving) matches Eibach's comfort-first tuning philosophy well.

Toyota Tacoma (2005-2023, 2024-2026)

Tacoma is one of Eibach's stronger Toyota platforms. Pro-Truck Sport is the volume pick. Stage 1, Stage 2, and Stage 2R Pro-Truck coilover kits are available. The 2024+ Tacoma gets dedicated Stage 2 and Stage 2R kits. Eibach also makes a Pro-Alignment Front UCA kit for lifted Tacomas. Tacoma owners who want maximum off-road capability typically pick ICON 2.5 VS RR instead. Eibach wins on Tacoma when the priority is daily driver comfort with a leveled stance.

Toyota Tundra (2007-2021, 2022-2026)

Tundra Eibach support is solid with Pro-Truck Sport, Stage 1, and Stage 2 packages, plus Pro-Lift-Kit springs and Pro-Truck 2.0 front coilovers. Heavier truck benefits from Eibach's progressive-rate springs that handle the weight without compromising small-bump compliance.

Toyota 4Runner (2010-2024, 2025-2026)

4Runner gets the full Pro-Truck range plus a unique Rear Load-Leveling System (in 200, 250, and 400 lbs/in spring rates) for owners running drawer systems, RTTs, and overland weight. The 4Runner is often used as an overland or daily-plus-light-trail rig, exactly Eibach's sweet spot.

Ram 1500 (2009-2018, 2019-2025)

Ram 1500 Eibach support includes Pro-Truck Sport shocks, Stage 1 packages, Stage 2 lift kits, Stage 2R coilover lift kits, and Pro-Lift-Kit springs (front and rear). The 2019-2024 Ram 1500 also gets a 0-3.6 inch Pro-Truck 2.0 front coilover and 0-1.5 inch reservoir rear shock. Ram owners often pick Eibach over Fox or ICON when the priority is daily driver smoothness.

Eibach vs Fox, Bilstein, ICON: how they compare

Eibach vs Bilstein

The closest competitor in the comfort-and-value space. Bilstein 5100 is the volume monotube shock with optional leveling positions. Eibach Pro-Truck Sport is a similarly priced shock-plus-spring package. Key difference: Bilstein leans on factory springs; Eibach pairs the shock with a matched progressive-rate spring. Eibach typically rides softer over broken pavement than the equivalent Bilstein 5100 setup. Bilstein wins on warranty (limited lifetime versus Eibach's 2-year shock warranty plus lifetime spring warranty). Eibach wins on out-of-box ride quality. For Mustang and Focus, Eibach is the default brand, Bilstein does not have an equivalent performance car spring lineup.

Eibach vs Fox

Different philosophies for different customers. Fox is performance-first off-road: race-bred valving, multiple body sizes (2.0, 2.5, 3.0, 3.2), DSC adjusters, OEM Raptor partnership. Eibach is comfort-first: progressive-rate springs, single body size, no external adjusters, plush daily ride. Fox wins decisively for serious off-road, adjustability, and Raptor builds. Eibach wins decisively for daily driver comfort and street-priority truck builds, plus the entire performance car category (Fox does not make Mustang springs).

Eibach vs ICON

Different price tiers and different customers. ICON 2.5 VS RR is a premium off-road coilover with adjustable damping and the Delta Joint UCA ecosystem. Eibach Pro-Truck Stage 2 is a comfort-biased mid-tier coilover without external adjusters. ICON for Toyota off-road builds. Eibach for daily-driven trucks that occasionally see a fire road, plus all performance car applications. Price gap is meaningful, ICON sits noticeably above Eibach in cost.

Eibach maintenance, warranty, and longevity

Eibach offers a limited lifetime warranty on Pro-Lift-Kit, Pro-Truck, Pro-Kit, and Sportline springs against breakage and sag, and typically a 2-year limited warranty on Pro-Truck shocks, Pro-Damper shocks, and Pro-Spacer wheel spacers. The lifetime spring warranty is strong, springs almost never fail in normal use anyway, but it is a clear signal of confidence in the engineering. Damage from off-road impacts, corrosion, or improper installation is not covered.

Eibach shocks are sealed monotube units. When the shock eventually wears out (typically 60,000 to 100,000 miles for daily-driven vehicles), you replace it. Springs essentially never wear out in normal use; an Eibach Pro-Kit or Pro-Truck spring that is intact will continue to perform for decades.

Why buy Eibach from Stage 3 Motorsports

Stage 3 has been an Eibach dealer for years, covering both the performance car catalog (Mustang, Focus, Fiesta, Maverick) and the Pro-Truck lineup (F-150, Super Duty, Tacoma, Tundra, Ranger, Bronco, Ram, 4Runner). We stock the full catalog, ship same-day on most in-stock orders, and offer a price match against any authorized Eibach dealer. Our build specialists run Eibach on their own cars and trucks, know the difference between Pro-Kit and Sportline, can tell you whether Pro-Plus is worth it over Pro-Kit alone, and will help you avoid buying more kit than you need. Call us at 623-434-5277.

Frequently asked questions

What is the difference between Eibach Pro-Kit and Sportline lowering springs?

Pro-Kit drops the car roughly 1 inch front and rear with progressive-rate springs that retain factory ride quality. Sportline drops the car roughly 1.5 inches front and rear with slightly stiffer rates for a more aggressive stance and better high-speed stability. Pro-Kit is the daily driver pick. Sportline is for owners who want a more aggressive look and accept a firmer ride. Both are excellent.

What is the difference between Eibach Pro-Plus and Sport-Plus kits?

Pro-Plus is Pro-Kit lowering springs paired with Eibach's matched front and rear sway bars (anti-roll bars). Sport-Plus is Sportline lowering springs paired with the same sway bars. Both kits address body roll directly, which is where most performance Fords feel "soft" from the factory. Pro-Plus for daily drivers. Sport-Plus for track-curious owners who want the more aggressive Sportline drop and stiffer feel.

Will Eibach Pro-Kit lower my Mustang too much for daily driving?

No. Pro-Kit is specifically engineered for daily driver duty. It drops the car roughly 1 inch and uses progressive-rate springs that ride softer than factory over broken pavement, while still controlling body roll and dive better than worn factory dampers. Most Mustang owners report daily-driving Pro-Kit cars feels better than stock, not worse.

Do I need Pro-Damper shocks with Eibach Pro-Kit springs?

Not immediately. Factory shocks will work with Pro-Kit springs and you will feel the handling improvement right away. However, factory shocks are valved for factory springs, so they become the limiting factor over time. Pro-Damper is the right upgrade when factory shocks tire out (typically 60,000+ miles) or when you want maximum performance from the lowered setup. If you have a fresh factory shock, run Pro-Kit alone first. If shocks are worn, Pro-Damper plus Pro-Kit at the same time.

What is the difference between Eibach Pro-Truck Stage 1 and Stage 2?

Stage 1 is a complete front and rear shock package using Pro-Truck monotube shocks with platform-specific tuning. Stage 2 swaps the front Pro-Truck Sport shock for a true threaded coilover with adjustable spring perch height, which gives precise ride-height adjustment between roughly 1.5 and 2.5 inches of front lift. Stage 2R adds a remote reservoir to the Stage 2 coilover for off-road heat dissipation. Stage 3R (F-150 only currently) is a full reservoir coilover front and rear. Most daily drivers buy Stage 1. Owners who want ride-height precision step up to Stage 2.

What is a progressive-rate spring and why does it matter?

A progressive-rate spring has variable spring rate: soft at low compression (small bumps) and progressively firmer at high compression (big impacts). The result is a ride that feels noticeably softer over broken pavement than a comparable linear-rate spring, but firms up automatically when you load the suspension or hit a big dip. Eibach has been refining progressive-rate spring engineering since 1951, and it is the core reason their kits ride softer than competitors at similar drops or lift heights.

Is Eibach better than Bilstein for daily driving?

For most daily drivers, Eibach Pro-Truck Sport rides slightly softer and more plush over broken pavement than the equivalent Bilstein 5100 setup, because Eibach pairs the shock with a matched progressive-rate spring while Bilstein leans on factory springs. Bilstein wins on warranty (limited lifetime versus Eibach's 2-year shock warranty), and Bilstein 5100 is typically priced lower. For performance cars (Mustang, Focus, Fiesta), Eibach is the default since Bilstein does not have a comparable spring lineup.

How is Eibach different from Fox or ICON?

Different customer profiles for trucks. Fox and ICON are performance-first off-road brands with race-bred valving, multiple shock body sizes, and external damping adjusters. Eibach is comfort-first, with a focus on progressive-rate springs, matched dampers, and OE-feel ride quality. If you wheel hard or want maximum adjustability, Fox or ICON. If you commute, Eibach. For performance cars (Mustang, Focus), Fox and ICON do not compete here, Eibach owns that segment.

Can Eibach shocks be rebuilt?

No. Eibach Pro-Truck and Pro-Damper shocks are sealed monotube units. When they wear out (typically 60,000 to 100,000 miles for daily-driven vehicles), you replace them. Eibach springs essentially never wear out in normal use and carry a limited lifetime warranty.

Do I need a leveling spacer with Eibach Pro-Truck?

No. The Pro-Truck Sport front shocks have integrated leveling capability that lifts the front 1.5 to 2 inches without a separate spacer. Pro-Truck Stage 2 coilovers achieve lift via the threaded spring perch. Pro-Lift-Kit springs achieve lift via spring change. None of the Eibach lift solutions require a spacer.

Do I need an alignment after installing Eibach?

Yes, in most cases. Lowering a car or lifting a truck moves camber, caster, and toe out of spec. Get a four-wheel alignment after installation. For lowered Mustangs, also install Pro-Alignment camber bolts (14mm) to bring camber back to spec. For lifted trucks running 2 inches or more of front lift, consider a camber and caster adjustment kit.

Are Eibach springs made in Germany?

Yes. Eibach engineering and primary manufacturing is based in Finnentrop, Germany. Eibach is the OEM spring supplier for Porsche, BMW, Mercedes, Audi, and many other premium automakers, and the same engineering rigor and progressive-rate technology that has been refined since 1951 goes into both the Pro-Kit Mustang springs and the Pro-Truck F-150 springs.