The Juggernaut, Super 30 Series Driver is a high-performance driver that has been tested up to 8500 RPMs. It features a bore of 3/4" (.750"), a key-way of 3/16" (part #1031 not included), and a 3/4" wide asymmetrical belt. With an engagement of 2,500 RPM and RPM capabilities of 8,500+ RPM, this driver is designed for high HP small block engines up to 15hp (HP rating may vary depending on the application). The Super 30 Series Driver features an all-new design with 3 rollers and 6 springs, eliminating the need for adjustments and limiting/eliminating belt slippage. It offers improved reliability and performance, making it compatible with all 30 series TAV kits with 3/4" bore (comet and aftermarket). Despite its slightly larger diameter than a regular 30 series driver, the Juggernaut, Super 30 Series Driver still works with the same covers and belt. The Juggernaut (Exclusively at GoPowerSports) is everything the original 30 series drivers lacks under load. No longer do you have to sacrifice your engines power or rpm capabilities! With this new Super 30 Series Driver, you can take full advantage of a high HP high RPM small block engine (196/212/225). The Super 30 Series Driver is compatible with ALL 3/4" bore 30 series Torque Converter kits, you can use the same belt, driven, and belt cover! This driver is recommended to be used with higher RPM engines, Stage 2 or higher. On a stock motor running at 3600 RPM you will NOT see any difference in performance and it may effect top end MPH. Running 4000+ RPM is where the Juggernaut shines. Features and Specs: Has been tested up to 8500 RPMs Bore: 3/4" (.750") Key-way: 3/16" 3/16" Key included 3/4" wide asymmetrical belt Engagement: 2,500 RPM RPM Capabilities: 8,500+ RPM All new design with 3 rollers and 6 springs No adjustments needed Limits/Eliminates belt slippage Improved Reliability and Performance on high HP small block engines up to 15hp, the HP rating may vary due to the application. Compatible with all 30 series TAV kits with 3/4" bore (comet and aftermarket). Slightly larger diameter then a regular 30 series driver but still works with the same covers and belt Things to know: Some of the newer Predator engines have a crankshaft that is slightly bigger than 3/4" (.750"). Please mic your crankshaft before ordering. It is highly recommended to use an impact gun to install this and all drivers. Hand tight is not tight enough. Do not run without a belt