Mopar Converter Bolt Kit - 5.7/6.1L Hemi

The ARP Mopar Converter Bolt Kit for 5.7L and 6.1L Hemi engines (MPN 147-7301) is a purpose-built fastener set engineered for high-performance torque converter applications. These chromoly bolts feature 8mm x 1.25 thread pitch, 0.7-inch length, and 12-point heads finished in black oxide, delivering the hardness and corrosion resistance required in demanding engine bay environments. This six-piece kit addresses a critical component in automatic transmission assemblies where standard fasteners cannot withstand converter loading and rotational stress.

Chromoly construction provides superior tensile strength compared to standard steel, allowing these fasteners to maintain clamp load under sustained high-RPM operation without galling or thread stripping. The 12-point head geometry distributes torque evenly across bolt shoulders, reducing fastener fatigue and improving repeatability during installation. Black oxide coating resists corrosion in engine compartment humidity while maintaining a professional OEM appearance. The precise 8mm x 1.25 specification ensures compatibility with OEM torque converter bolt holes on fifth-generation Hemi platforms.

This kit serves builders and technicians performing torque converter replacement, transmission rebuilds, or performance engine modifications on 2003–2008 Dodge Ram trucks and comparable Mopar platforms equipped with NAG1 transmission architecture. Users working on high-output engine swaps or supercharged applications benefit from the upgrade in fastener metallurgy, as standard converter bolts frequently fail under elevated power levels. The set eliminates the need to source fasteners individually and ensures all six bolts meet identical specifications for balanced assembly.

ARP is recognized in the powersports and automotive fastener market for specializing in high-strength bolts designed for critical drivetrain applications. This Mopar converter bolt kit exemplifies their approach: verified material selection and precision manufacturing for components where fastener failure results in catastrophic transmission damage.