GM Torque Converter 10in Big Shot Extra HD

The GM Torque Converter 10in Big Shot Extra HD is a heavy-duty transmission component engineered for high-performance automotive applications demanding superior torque multiplication and stall characteristics. Designed by Transmission Specialties, this 10-inch diameter converter is built for drivers and mechanics who need reliable power transfer in demanding conditions. The Big Shot Extra HD designation signals reinforced construction—ideal for both street performance and off-road use where transmission durability directly impacts vehicle reliability and longevity.

This torque converter features a 3700–4100 RPM stall range, allowing the engine to build optimal boost before load engagement—critical for maximizing acceleration and reducing transmission shock during hard launches. The 10.750/11.500 inch bolt circle accepts both TH350 and TH400 transmission housings, making it a versatile drop-in solution for classic and modern builds alike. The Extra HD construction reinforces the converter's internal fins and sealing surfaces, ensuring it withstands repeated high-torque cycles without fatigue or fluid leakage—especially important in vehicles running elevated power outputs or towing loads.

Buyers restoring or upgrading TH350/TH400-equipped vehicles—whether hot rods, muscle cars, trucks, or off-road platforms—will appreciate the Big Shot Extra HD's blend of stall performance and durability. Installation requires proper transmission-to-converter clearance verification and fluid service; most technicians recommend a complete system flush and filter replacement when installing a new converter. At 28.58 lbs, this component integrates seamlessly into existing transmission assemblies without modification, making it an efficient upgrade for anyone seeking improved drivability and reduced transmission wear.