J.W. Performance automatic transmissions are offered in a variety of types for various applications. They are made of high-quality materials to exacting specifications and undergo inspections prior to shipment. J. W. Performance manufactures automatic transmissions and component parts for circle track, drag racers, off-road racers, street, and strip enthusiasts

Estimated HP Capacity: 400hp Automatic Valve Body, optimized for improved shift characteristics Perfect OEM Replacement style transmission 6” Tailhousing HD Intermediate Sprag Assembly High Energy Clutches and Steels Adjustable Modulator Fully Dyno Tested Street Lethal TH350 Transmission HP Rating: 400hp Bellhousing: Chevy OEM Valve Body: Automatic/HD

Designed to deliver trouble-free, consistent performance
Right for your vehicle and lifestyle
Made from high-quality materials for ultimate durability
Manufactured to meet or exceed strict quality requirements


J.W. Performance Transmission, Inc. is a leading manufacturer of high performance automatic transmissions and components for drag and off road racers, street and strip enthusiasts, and more. Headquartered in Rockledge, Florida, J.W. Performance® manufactures thousands of quality transmissions and related parts ranging from flexplates to bellhousings. The company pioneered over 250 products since 1976. Many of its innovative solutions remain the industry standard and are widely used by professional racers in the United States and abroad. 

Horsepower ratings are approximates, other factors contribute to transmission horsepower ratings, i.e. vehicle weight, torque, driving habits, etc.