Flexplate Chromoly SFI AMC/Jeep 401 1971-77

The Flexplate Chromoly SFI AMC/Jeep 401 1971-77 is a premium replacement flexplate engineered for high-performance AMC and Jeep applications featuring the legendary 401 cubic-inch V8 engine. This component bridges your engine's crankshaft to the torque converter, absorbing rotational stress while maintaining precise balancing for smooth power delivery. Built for enthusiasts and builders who demand reliability in vintage muscle cars, custom Jeeps, and street machines, this flexplate is essential when upgrading to modern transmissions or restoring original driveline integrity on 1971–1977 models.

Manufactured from chromoly steel, this flexplate offers superior strength-to-weight characteristics compared to cast iron alternatives, reducing inertial mass while withstanding the high torque loads generated by the 401's 320+ horsepower output. The SFI certification (Speciality Equipment Market Association) ensures it meets stringent safety standards for drag racing and performance use, featuring reinforced bolt bosses and optimized flex zones that absorb shock loads without cracking. Precise manufacturing tolerances maintain dynamic balance, critical for eliminating vibration that degrades bearing life and transmission smoothness.

This flexplate is ideal for AMC 401 engine swaps, restoration projects, and performance builds where OEM cast flexplates have deteriorated or proven insufficient for increased boost or nitrous applications. Installation requires removal of the torque converter and bell housing; proper alignment and torque specifications are essential for safety and longevity. Weighing 8.22 pounds and measuring 14 inches in diameter, it bolts directly to the 401's crankshaft flange and accommodates standard AMC/Jeep automatic and modern three- or four-speed transmissions common in restomod builds.