Before purchase, every Speedtech Chassis configuration is reviewed by our team to confirm fitment, performance goals, and upgrade compatibility.
Create your build to receive expert validation and final pricing, or share your build goals with a Speedtech specialist to get a custom recommendation.
The Speedtech ExtReme Chassis with Torque Arm Rear Suspension transforms your ’68–’72 Chevelle or GTO into a car that finally drives as good as it looks. You get the aggressive stance and wide tire fitment you want, paired with balanced, confidence-inspiring handling you can actually enjoy on the street.
Built around Speedtech’s proven suspension geometry and tuned with QA1 or JRi coilovers, this chassis delivers a connected, predictable feel without the harshness that often comes with high-performance setups. The dual-power rack from Sweet Mfg. keeps steering precise and responsive, giving you control you can trust whether you’re pushing it or just cruising.
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 creates a strong, well-controlled foundation, while 7075 forged aluminum spindles deliver lightweight strength up front. It’s built for confident performance on the street and beyond.
BINDLESS REAR END SUSPENSION
Torque Arm Rear Suspension, teamed with articulating trailing arms, is designed to articulate fully through the motion of your suspension travel, giving you better handling and a higher quality ride.
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.
BOLT-ON INSTALLATION, NO GUESSWORK
This isn’t a weld-in or cut-up job. The ExtReme Chassis bolts directly to the stock location, making installation straightforward for builders, pros, or advanced DIYers. Transmission crossmembers are fully adjustable to accommodate just about any engine/trans combo you throw at it.
