The Speedtech ExtReme Chassis with Independent Rear Suspension takes your ’67–’72 C10 from a good-looking truck to one that truly delivers behind the wheel. It brings together the stance you want, the tire fitment you need, and the control these trucks have always lacked—without giving up the ability to comfortably drive it anywhere.
Optimized suspension geometry, forged aluminum spindles, and clearance for up to 315mm front tires ensure every aspect is engineered for real-world performance. And the Independant Rear Suspension giving you all of the rear end compliance, strength and tuning ability you could over need.
AGGRESSIVE STANCE, WIDE TIRE FITMENT
Get the low, wide look without fighting the setup.
Designed around modern wheel and tire packages, this chassis accommodates up to a 315/30/18 front tire with full steering clearance. High-clearance control arms and dialed geometry let you bring the truck down where it belongs while maintaining proper suspension travel and drivability.
This is how you achieve that pro-touring stance without compromise.
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
The IRS system changes how a C10 drives.
It delivers improved traction, better control over bumps, and a more stable feel at speed. Instead of the rear end feeling loose or unpredictable, the truck stays composed and planted—giving you confidence in every situation.
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!
