GM THM 700R4 4L60 Sonnax Governor 729 Gas Engines 1982-1993 Corvette, Camaro, Firebird Sonnax blue gear governor for High Performance Applications, fits GM Turbo-Hydramatic 700-R4, 4L60 Transmissions. Popular with the racing crowd, use this governor for high output engines or differential gearings and applications with larger tires. For Gas engines only, not for Diesel. If you have Diesel please check my other listings This governor works on 1982 - 1993 TH700R4 (4L60 but not 4L60E).