Crank Adapter 8-Bolt Gen-3 Hemi to GM TC

The J-W Performance Crank Adapter 8-Bolt Gen-3 Hemi to GM TC is a precision-engineered crankshaft adapter designed to mate Mopar Gen III Hemi engines with GM torque converters and transmission systems. This steel adapter enables engine platform conversions and custom powertrain builds by bridging the mechanical interface between two otherwise incompatible crankshaft bolt patterns—the 8-bolt Hemi configuration and GM's torque converter spline specification.

Built from steel in natural finish, the adapter weighs 1.5 lbs and measures 4.4 x 3.6 x 6.45 inches, making it compact enough for tight engine bay configurations. The 8-bolt design ensures secure mechanical engagement with the Gen-3 Hemi crankshaft while the GM TC interface maintains concentricity with the transmission's input shaft. This adapter is essential for builders undertaking engine swaps where Hemi performance characteristics must interface with GM automatic transmission platforms—a common scenario in hot rod, muscle car, and performance truck builds where modern Hemi architecture meets established GM drivetrain infrastructure.

Custom powertrain integrations require precision mechanical components that eliminate guesswork at the crankshaft-to-transmission interface. The J-W Performance adapter handles this critical junction, allowing builders to leverage Hemi engine performance without fabricating custom solutions. Proper installation requires correct torque specification and alignment verification; this adapter assumes the builder has baseline knowledge of engine and transmission assembly procedures. For Mopar-to-GM platform conversions, this adapter is a purpose-built solution that eliminates the need for one-off machining or adapter stacking.