Born from its founder’s 1966 LS-powered Chevelle transmission swap, Shiftworks, Inc. makes conversion kits, shifters and related components that let classic-car owners upgrade GM automatic transmissions while keeping the factory interior appearance. In business since 1991, the Ontario, New York company also rebuilds original GM floor shifters and adapts them for modern transmissions, including applications reaching eight-speed automatics.
Rockland Standard Gear, IncRockland Standard Gear builds and remanufactures manual transmissions, transfer cases, and related powertrain components, with its Tranzilla Magnum conversions at the heart of its performance work. The company says it has a 30-year track record and builds more than 100 units each week, while its specialty work includes remanufacturing the Corvette ZF S6-40 for ZF and GM—the only North American source for those parts. RSG also backs its products with customer technical support and a stated inventory exceeding $1 million.SLOATSBURG, NY
Gearstar Performance TransmissionIn Akron, Gearstar Performance Transmissions builds high-performance automatic transmissions tailored to an engine’s power, gearing and intended application. Owner Zack Farah came out of a high-volume transmission operation more than 25 years ago to focus on the custom performance work that off-the-shelf units could not provide. Each transmission is handled by one builder, and the company remains under its original owner while its employee-owned team serves automotive enthusiasts across the country.AKRON, OH
Tri Component Products CorporationSince 1967, Tri Component Products Corporation has supplied automatic-transmission rebuilders with replacement parts and problem-solving components for torque converters and transmissions. The Bronx-based company draws on more than five decades of industry experience and maintains specialized offerings for high-performance and antique applications, including friction materials used in lockup clutches.BRONX, NY
Capital Core IncFrom its Columbus headquarters and Detroit satellite division, Capital Core Inc researches, manufactures, and distributes automatic transmission parts for repair shops and other small to medium-sized businesses. With more than 20 years in the transmission-parts industry, the company sources from tier-one suppliers and develops custom and stage kits through its R&D team. Capital Core supports more than 400 businesses and ships parts internationally.COLUMBUS, OH