1955-57 Chevy Car Heidts Pro Touring Bolt-On Independent Rear Suspension

The Heidts Pro-G® Bolt-In Independent Rear Suspension (IRS) is an industry-leading performance system designed specifically for the 1955–1957 Chevy Tri-Five. This award-winning architecture brings modern supercar handling to the classic Chevy platform without requiring the permanent modifications usually associated with an IRS swap.

Performance and Advanced Geometry

• Superior Handling: Based on proven Pro-G® geometry, this system allows each rear wheel to track the road independently. This provides a massive improvement over the stock solid axle in both ride quality and high-speed cornering stability.

• High Horsepower Capacity: Engineered as a true high-performance package, the system is designed to withstand the torque of modern engine builds. It features heavy-duty components and reinforced links to ensure reliability under aggressive driving.

• Precision Camber Control: The geometry is optimized to maintain the best possible tire contact patch throughout the suspension's travel, ensuring maximum grip during hard lateral transitions on the autocross or road course.

• Refined Ride Quality: The independent nature of the suspension significantly reduces unsprung weight compared to a solid axle, resulting in a much more sophisticated and comfortable ride on the street.

Integration and Engineering

• True Bolt-In Design: Unlike many IRS systems that require extensive floor cutting and welding, this kit is designed for a direct bolt-in installation. This makes it an ideal choice for finished cars or projects already underway where preserving the original floor pan is a priority.

• Enhanced Exhaust Clearance: This Tri-Five IRS frame incorporates specific design enhancements to provide more room for routing dual exhaust systems, a common challenge with independent rear setups in classic cars.

• Adjustable Stance: Equipped with billet adjustable coil-over shocks and 9-inch springs, allowing you to dial in the perfect ride height and valving for your specific driving style.

Kit Includes:

• Finish Options: Available as a Plain Steel or Polished Package for show-quality aesthetics.

• Braking: Performance rear disc brakes with smooth or drilled and slotted rotors.

• CV Shafts: Heavy-duty CV shafts available in Standard or High HP ratings.

• Differential: 9-inch based center section with Positraction gears.

• Suspension: Billet adjustable coil-over shocks and 9-inch performance springs.

Available Options:

• Parking Brake: Optional dedicated park brake calipers for street-driven builds.

• High-HP Upgrades: Reinforced half shafts for high-output engine combinations.