Th350/Th400 Superholesho

The B and M AUTOMOTIVE TH350/TH400 Holeshot Torque Converter is engineered for builders and enthusiasts who demand responsive power delivery from their classic or modified transmission setups. Designed specifically for both TH350 and TH400 automatic transmissions, this converter sits at the critical interface between engine and gearbox, managing fluid dynamics to multiply torque during acceleration. Whether you're building a street machine, drag racer, or high-performance cruiser, the Holeshot converter addresses the fundamental challenge of getting power from crankshaft to wheels efficiently and quickly.

This converter employs a tight stall speed design optimized for quick off-the-line launch characteristics—the defining feature of a Holeshot-class unit. The internal impeller and turbine are precision-matched to minimize slippage under acceleration while maintaining highway cruising efficiency, striking the balance between responsiveness and drivability. Weighing 23.55 lbs and measuring 14 × 7.3 × 15.1 inches, the converter is compact enough for standard installation while housing the fluid capacity and internal geometry needed to handle upgraded engine outputs. The dual-transmission compatibility means a single unit works across both three-speed platforms, reducing complexity for swap builds or transmission upgrades.

Builders working with carbureted or fuel-injected engines benefit most from this converter's predictable engagement and repeatable launch performance. Installation requires proper torque converter balancing and alignment with your specific engine and transmission combination; consultation with a qualified transmission specialist is recommended to ensure compatibility with your vehicle's weight, power output, and intended use. The Holeshot design excels in street and strip applications where initial acceleration is prioritized, making it ideal for restorations, hot rods, and performance rebuilds targeting TH350 or TH400 platforms.