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ExtReme Front Suspension

At Speedtech Performance, racing isn’t just part of our story—it’s the foundation of the products we build. Decades of track experience have driven us to innovate, test, and refine suspension systems that set the standard for performance. Our engineering delivers the most advanced suspension geometry in the game, giving you unmatched handling, precision, and confidence whether on the street or the track.

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Built for Pros Who Build Every Day

From streamlined catalog selection to flexible fitment and proven performance, this system is designed to make installs more efficient, builds cleaner, and customers happier. With expert support and upgrade-ready options, it's the dependable foundation your shop can count on—build after build.

A true performance build starts with the right foundation.

While classic muscle cars deliver timeless style, their original chassis were never designed for the power, grip, and performance expectations of modern drivers.

At Speedtech Performance, we engineer chassis systems that transform vintage cars and trucks into true modern performance machines. Through advanced suspension geometry, race-inspired engineering, and a complete systems approach, our chassis deliver the strength, precision, and confidence serious builders demand.

As you explore this page, you’ll learn why the chassis matters and what makes Speedtech different from the competition.

Engineered for Maximum Grip, Precision, and Everyday Confidence

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A BUILDERS & RACERS POINT OF VIEW - A CAR THAT YOU WANT TO DRIVE FAST

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Engineered for Maximum Grip, Precision, and Everyday Confidence

30° ± Steering Angle: Wide front tires provide more grip, which means better control and stability when cornering hard or pushing a car at its limits. A larger steering angle allows the wheels to turn sharper, giving the driver more maneuverability and helping the car hold tighter lines, especially in racing or drifting situations. Together, they give the front end more authority, so the driver can steer with confidence.

315 TIRES WITH FULL STEERING AND CORRECTED ACKERMANN

Widest Tire Fitment: As we mentioned above, when you are pushing your car to the limits, you need more contact area with the ground. We have engineered our front suspension to allow for the biggest tire and steering angle combination on the market.

Fitment Examples: 1967-1969 Camaro - 315/30R18, 1967-1970 Mustang - 315/30R18, 1968-1970 Charger - 335/30R18,

Internal Gusseting: We use internal gusseting within our chassis design. This engineering approach allows us to use thinner frame rails while actually increasing torsional strength and rigidity. The result is a lighter, more efficient frame that resists flex under extreme loads, delivering sharper handling and long-lasting durability.

INTERNAL GUSSETING

Forged Aluminum Spindle: The Speedtech forged aluminum spindle is built for uncompromising strength and precision. Forging creates a denser, tougher structure than casting, ensuring the spindle can handle the extreme loads of high-performance driving without flex or fatigue. Paired with the proven C7 Corvette dual-bearing hub, it delivers greater durability, smoother operation, and improved load capacity.

SPEEDTECH SPINDLE WITH C7 HUB

Proper Ackermann Steering Geometry: Ackermann steering geometry refers to the way the inside and outside wheels turn at slightly different angles when cornering. This is important because each wheel follows its own path through a turn. Proper Ackermann ensures that both front tires track naturally without scrubbing or fighting each other. The result is smoother steering, less tire wear, and maximum grip through corners.

CORRECTED ACKERMANN DIAGRAM

Sweet Mfg. Dual Power Rack and Pinion: When driving aggressively on the track, steering precision and control are everything. A dual power rack and pinion system delivers smoother, more consistent steering response by balancing assist across both sides of the rack. This eliminates flex and uneven loads, giving the driver sharper feedback, improved stability, and confidence in high-speed cornering. The result is steering that feels direct and predictable—even under the most demanding track conditions.

SWEET MFG. POWER STEERING RACK

3-Piece Tunable Sway Bar: A 3-piece tunable sway bar gives you the ability to fine-tune your suspension for any driving style or track condition. Its modular design allows quick adjustments to stiffness, so you can dial in the perfect balance between comfort and performance. The result is sharper handling, reduced body roll, and maximum grip when you need it most.

SWAY BAR WITH LINKAGE

Torque Arm Rear Suspension

Torque Arm Advantage: The Speedtech Performance torque arm is engineered to put power to the ground with maximum efficiency. By controlling axle rotation and improving rear suspension geometry, it delivers superior traction, reduced wheel hop, and more consistent handling. The result is a suspension system that keeps the car planted and predictable—perfect for serious performance driving.

TORQUE ARM IN CHEVELLE CHASSIS

Articulating Trailing Arms: On a torque arm rear suspension, articulating trailing arms allow the rear end to move more naturally without binding. This improves ride quality, keeps the suspension planted, and maintains traction under hard acceleration and cornering. The result is smoother articulation, better handling, and greater consistency when driving at the limit.

TORQUE ARM WITH TRAILING ARMS

Torque Arm vs. 4-Link: A torque arm rear suspension delivers superior traction and stability compared to a traditional 4-link. Because it isn’t locked into binding geometry, the suspension can move freely through its travel, giving smoother articulation and more consistent handling. This means better grip, sharper cornering, and improved suspension reaction without the harshness or unpredictability of a 4-link under load.

TORQUE ARM IN TRI-5 CHASSIS

9-Inch Gearing: The 9-inch gear setup is a proven choice for performance driving, offering unmatched strength and durability under high loads. With its robust design and wide range of gear ratio options, it delivers the perfect balance of acceleration and top-end speed. Strong, versatile, and reliable—the 9-inch is the go-to solution for putting serious power to the pavement.

FORD 9IN AXLE HOUSING AND CENTER SECTION

Independent Rear Suspension

High Motion Ratio Performance: The Speedtech IRS with its high-mount design and high motion ratio delivers the ultimate balance of strength, control, and responsiveness. The high motion ratio allows the shocks and springs to work more efficiently, giving precise tuning and improved grip through every corner. Combined with the stability of an independent rear suspension, the result is smoother travel, sharper handling, and unmatched confidence when pushing the limits on track or street.

HIGH-MOUNT CANTILEVER IRS

Strength Where It Counts: Every Speedtech IRS comes standard with axles rated to handle 1,200 horsepower, giving you the confidence to push hard on the track without compromise. For extreme builds, upgrades are available to handle over 1,800 horsepower. This unmatched strength ensures reliable power delivery, improved durability, and the peace of mind that your suspension is built to withstand the most demanding performance driving.

DUTCHMAN AXLE

Engineered for Maximum Grip: The Speedtech IRS is designed with longer rear control arms to deliver more suspension travel without sacrificing geometry. By keeping the suspension within the optimal camber gain curve, the tires maintain a larger, more consistent contact patch through corners. The result is improved grip, smoother weight transfer, and more predictable handling—exactly what’s needed for serious performance and track driving.

OPTIMIZED SUSPENSION TRAVEL

Multiple Shock Mounting Options: The Speedtech IRS gives racers the edge with three shock mounting options—high-mount cantilever, low-mount cantilever, and traditional mounts. Each setup allows you to fine-tune suspension geometry and motion ratio for maximum grip, balance, and responsiveness. This flexibility means you can tailor your car’s handling to different track conditions, ensuring smoother suspension travel, sharper cornering, and faster lap times.

TRADITIONAL MOUNT IRS

Ultimate Suspension Tuning: The Speedtech IRS is engineered for racers who demand precision. With full adjustability for caster, camber, ride height, and toe, plus a 3-piece tunable sway bar, it gives you complete control over suspension geometry and roll stiffness. This means you can fine-tune your setup for different track conditions, maximizing grip, stability, and responsiveness. The result is sharper cornering, smoother balance, and the ultimate advantage in performance and track driving.

TRADITIONAL MOUNT IRS WITH QA1 MOD SHOCK

Strength and Precision Built In: The Speedtech IRS comes equipped with a forged aluminum spindle for maximum strength and durability under extreme track conditions. Forging creates a tougher, more reliable part that resists flex, keeping your suspension precise and predictable at high speeds. Each spindle also features a billet aluminum parking brake mechanism—lightweight, strong, and built to perform. Together, they deliver the perfect balance of strength, precision, and reliability for serious performance and track driving.

SPEEDTECH SPINDLE WITH PARKING BRAKE

Why the Best Choose the ExtReme-XS: If you want to be the best, you need components engineered to perform at the highest level. Speedtech delivers innovation, precision, and proven results on and off the track. That’s why the best of the best choose the Speedtech ExtReme-XS subframe—our most advanced design, built for ultimate strength, unmatched suspension geometry, and complete confidence at the limit. When winning matters, Speedtech is the foundation you can trust.

ExtReme-XS: Geometry Perfected, Performance Elevated:

The ExtReme-XS delivers all of the race-proven suspension geometry Speedtech is known for—now in a setup that’s lighter, faster, and stronger than ever. Engineered for maximum performance, it combines precision handling with reduced weight for quicker response and sharper control. Added brake cooling induction ensures consistent stopping power, keeping you in command lap after lap.

StrenX Metal Blend: Speedtech’s ExtReme-XS chassis and subframes are made up of StrenX and Docal metal. StrenX and Docal are metal blends engineered to deliver exceptional strength while remaining remarkably lightweight. This unique balance reduces overall vehicle weight without sacrificing durability, giving you sharper handling, quicker acceleration, and shorter lap times. On the track, less weight and more strength means pure speed and performance you can rely on.

EXTREME-XS CHASSIS BEING WELDED

Brake Cooling Where It Counts: With brake cooling induction built directly through the frame rails, Speedtech delivers a smarter way to manage heat under extreme track conditions. By channeling fresh air straight to the brakes, temperatures stay lower, fade is reduced, and stopping power remains consistent. The result—more confidence in every corner, faster lap times, and the performance edge you need on race day.

BRAKE COOLING INDUCTION

ExtReme Front Suspension

A BUILDERS & RACERS POINT OF VIEW - A CAR THAT YOU WANT TO DRIVE FAST

Engineered for Maximum Grip, Precision, and Everyday Confidence

Torque Arm Rear Suspension

Independent Rear Suspension

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