The Detroit Speed ZR12 IRS Differential delivers modern strength, precision, and reliability to C2 and C3 Corvettes equipped with the DECAlink™ rear suspension system. Fully assembled and ready for installation, it combines a lightweight aluminum case with proven GM 12-bolt internals and a 33-spline Truetrac differential.
Designed for performance-driven builds exceeding 400 horsepower, the ZR12 provides refined operation, exceptional durability, and gear ratio flexibility for street, Pro Touring, or competition use.
ENGINEERED FOR STRENGTH & PRECISION
At the core of the ZR12 is a high-strength aluminum housing paired with robust GM 12-bolt internal components—delivering the durability demanded by high-output engines. The 33-spline Truetrac differential provides smooth, torque-biased power distribution without clutches, ensuring consistent traction and low maintenance operation.
Available in 3.55, 3.73, and 4.11 ratios, the ZR12 allows builders to tailor performance to their driveline package. Optional REM polished gears further enhance refinement by reducing friction, lowering operating temperatures, and extending gear life - resulting in quieter, more efficient performance.
BOLT-IN CONVENIENCE
The ZR12 IRS Differential is engineered as a direct-fit solution for Detroit Speed DECAlink™ rear suspension systems. Delivered fully assembled - saving time while ensuring precision alignment and reliability.
FEATURES & BENEFITS
- Rated to 1200 Horsepower – Engineered to handle serious power levels.
- GM 12-Bolt Internal Components – Proven durability and torque capacity.
- 33-Spline Truetrac Differential – Smooth, automatic torque biasing without maintenance-heavy clutch packs.
- Choice of Gear Ratios (3.55, 3.73, 4.11) – Tailor performance to driveline package.
- Optional REM Polished Gears – Reduced friction, quieter operation, and increased longevity.
- Lightweight Aluminum Case – Reduces unsprung weight while maintaining strength.
- Fully Assembled & Ready to Install – No internal setup required.
- Compatible with Detroit Speed Rear Axle Kits – Match axle strength to your horsepower goals.
FITMENT NOTES
- Fits: 1963–1967 Corvette (C2), 1968–1982 Corvette (C3)
- Compatibility: Requires Detroit Speed DECAlink™ Rear Suspension
- Not Compatible: Factory C2/C3 stock-type rear suspensions
- Install Type: Direct-fit within DECAlink™ system; fully assembled
- Power Level Matching: Pair with Detroit Speed Rear Axle Kits (070652DS 800 HP rated, or 070651DS 1200 HP rated)
Specifications
- Emission Code4
- ManufacturerDetroit Speed
- Manufacturer Part Number070650-373DS
- Product TypeDifferential Assembly
- Carrier StyleGM 12 Bolt
- Case MaterialAluminum
- Gear Ratio3.73
- Yoke Style1350
- DifferentialTru-Trac
- Spline Quantity33
- REM Polished IncludedNo
