SKU: 21230 Category:

ExtReme Camaro/Firebird 1970-1981 Subframe


Upgrade your Second Gen. Camaro with the Speedtech Performance ExtReme Subframe featuring our forged spindles. This ExtReme Subframe is designed to handle all driving conditions with ease, making it ideal for daily driving, autocross, and track days. The box welded construction and tabbed through frame gusseting provide added torsional rigidity, while the fully adjustable wheel alignment and corrected Ackerman for better grip during cornering allow for a customizable driving experience. The package includes custom designed upper and lower control arms, a durable Sweet Mfg. dual power rack and pinion steering, JRI Speedtech Performance custom valved single adjustable coil over shocks, and a splined front sway bar with spring rate options. The exclusive ExtReme forged spindles offer optimized geometry and improved KPI/SAI angles, providing increased tire grip and a more precise driving experience.



  • Full ExtReme subframe
  • Custom designed upper and lower control arms with high clearance  to accommodate wide wheels
  • Durable Sweet Mfg. dual power rack and pinion steering
  • JRI Speedtech Performance custom valved single adjustable coil over shocks, spring rates of your choice included
  • Tuned, adjustable, splined front sway bar with spring rate options for street, pro-touring/auto cross and road course
  • Exclusive ExtReme forged spindles with C7 hubs and maintenance free sealed bearing
  • Fully adjustable transmission cross member that will accommodate all engine and transmission combinations


  • Boxed construction welded with tabbed through frame and cross members for added torsion rigidity
  • Speedtech Performance Chassis and Sub Frames come exclusively with forged 7075 aluminum ExtReme spindles
  • 78% motion ratio for faster shock response and more precise control
  • Increased shock length providing more suspension travel
  • Virtually zero bump steer, .005” over the full travel of the system
  • 30 +/- 3 deg of steering angle
  • Our exclusive system provides optimum Ackerman for up to 20% more inside tire grip when cornering
  • Industry exclusive optimized roll center for low, mid & high travel
  • 3-piece Chromoly tubular splined sway bar standard, optional spring rates
  • Excellent system for street, autocross & track days
  • Ride heights to meet your vision for styling the car exactly the way you want it
  • Accommodates 315/30/18 tire with full steering


  • We took the best forged aluminum spindle made and made it better
  • Forged from 7075 aircraft grade aluminum
  • Optimized geometry unmatched in any other Corvette style Spindle
  • Significantly improved KPI/SAI angle
  • Requires less caster to achieve maximum tire contact patch
  • Significantly reduced scrub radius
  • Billet steering arm provides increased Ackerman angle
  • Achieves optimum tire slip-angles, increasing front tire grip
  • Maintains optimum tire grip with less backspaced wheels
  • Brake caliper bolt pattern is direct carryover from Corvette C5 & C6 opening up many options
  • Comes standard with a maintenance free factory GM Corvette C7 hub & sealed bearing
  • Excellent for Autocross, Road Course & Street
  • From parking lots to tracks, it simply drives & turns better


  • LS, LT, BBC, SBC, motor mount adapter plates with Energy Suspension motor mounts
  • Steering Column: Ididit tilt steering column necessary for proper steering shaft clearance with black powder coat
  • Headers: 321 stainless steel, slip fit, 1 7/8” length with 3” collector and O2 bung, high clearance
  • Stainless steel 2 joint, 1 shaft, steering shaft kit to work with our headers
  • Milodon oil pan that will work with our sub frame
  • Holley intercooler pipe kit
  • Stainless Steel notched Rick’s Tank with Vapor Worx system, return less, in tank pump module varies based on engine HP
  • Front and rear axle brake kits from top tier suppliers
  • Forgline Wheels with custom offset to get exactly the look you are going for

At Speedtech Performance, our ethos is all about helping car enthusiasts achieve their dream of having the perfect system to modify their car according to their individual needs and desires. We believe that not everyone knows what they want or what is possible, and that’s why we offer a free no-obligation consultation to everyone. We take the time to understand you and your goals for the car, whether it’s for long distance travel, daily driving, or track days. Our focus is on maximizing wheel and tire widths while maintaining the original styling of the car. Our suspension systems are designed from scratch, with optimized front-end geometry to improve Camber caster settings, minimize bump steer, and improve camber and caster gain during driving. Our suspension designs provide 20% more outside tire grip while steering with corrected Ackerman. We pride ourselves on making the best pro touring suspension in the world, with a focus on performance-driven designs. Our prices are competitive, and we deliver a superior product that will exceed your expectations.