The Speedtech ExtReme Chassis with Independent Rear Suspension transforms your 73-87 Squarebody into a truck that drives as good as it looks. Built for the way these trucks are actually used today, it delivers a dialed-in stance, room for serious wheel and tire packages, and confident handling you can feel every time you get behind the wheel.
Engineered with proprietary suspension geometry, QA1 or JRi coilovers, and a precision dual-power steering rack from Sweet Mfg., this system gives your C10 a connected, predictable feel with a ride quality that stays comfortable on real roads. Whether you’re cruising, hitting events, or pushing it a little harder, it responds the way a modern performance vehicle should.
AGGRESSIVE STANCE, WIDE TIRE FITMENT
Get the look right without sacrificing function.
Designed around modern wheel and tire packages, this chassis supports up to a 315/30/18 front tire with proper steering clearance. High-clearance control arms and dialed geometry allow you to bring the truck down where it should sit, while still maintaining suspension travel and drivability.
This is how you get that low, wide, pro-touring stance done right.
PRECISION STEERING FEEL, DUAL RACK PERFORMANCE
The dual-power rack and pinion from Sweet Mfg. delivers a quicker ratio and more precise feedback, so the truck feels responsive and easy to place on the road.
Paired with Speedtech’s spindle and steering geometry, you get a steering feel that’s tight, predictable, and confidence-inspiring without being overly sensitive.
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
Built to handle real use, not just look good.
The chassis features box-welded construction with tabbed-through gusseting to increase strength and durability. Forged 7075 aluminum spindles reduce weight while maintaining rigidity where it counts.
It’s engineered for long-term performance, whether you're putting miles on it or pushing it harder.
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!
