The Speedtech ExtReme Chassis with Independent Rear Suspension is engineered to transform 1960–1966 GM trucks into modern, high-performing street machines—delivering a lowered stance, wide tire clearance, exceptional chassis rigidity, and confident handling on both the street and track.
Built with proprietary suspension geometry and tuned with QA1 or JRi coilovers, the system is complemented by a precision dual-power rack and pinion from Sweet Mfg., providing connected, predictable steering with a refined, controllable ride. Forged aluminum spindles and optimized front-end geometry allow clearance for wide front tires, ensuring real-world performance and modern drivability.
The Independent Rear Suspension adds unmatched rear-end compliance, strength, and tunability—maximizing traction, smoothing the ride, and delivering consistent handling under all conditions.
1960–1966 Chevrolet C10
AGGRESSIVE STANCE, WIDE TIRE FITMENT
Designed with wide wheel and tire combos in mind, this subframe accommodates up to a 315/30/18 tire with full steering clearance. High-clearance control arms and optimized geometry let you slam the car for that strong pro-touring look without compromising performance or drivability.
PRECISION STEERING FEEL, DUAL RACK PERFORMANCE
At the heart of this system is a dual power rack and pinion from Sweet Mfg., giving you a quicker ratio and improved feedback for confident cornering. Combined with our billet steering arm and ExtReme spindle geometry, you’ll feel in full control at every turn.
RACE-BRED STRENGTH, STREET-READY RELIABILITY
Box-welded construction with tabbed-through gusseting maximizes torsional rigidity, while our 7075 forged aluminum spindles bring lightweight strength to the front end. It’s engineered to take abuse—on and off the track.
INDEPENDENT REAR SUSPENSION
Speedtech Performance’s ExtReme IRS system is not just an upgrade; it's a complete transformation of your classic car's handling capabilities. By incorporating advanced suspension technology, it delivers a modern driving experience while preserving the timeless appeal of your vintage vehicle.
MADE IN THE USA WITH PRIDE
Every Speedtech subframe is built right here in the USA, using premium materials and expert craftsmanship. We believe in building it right the first time—with no compromises.
INSTALLATION MADE EASY, NO GUESSWORK
The ExtReme Chassis bolts directly to the stock location, making installation straightforward for builders, pros, or advanced DIYers. To achieve the proper driveline angle, floor and tunnel modification will need to be done. However, Speedtech offers a full transmission tunnel, driveline and axle tunnel kit. This teamed up with our IRS closeout sheet metal, all of the material is ready for you!
