The new line of Zodiac's 5 Speed Big Twin transmission gears and shafts is now available. There are other transmission parts on the market, but none are as economically priced nor have they quality in engineering and CAD/CAM design as these gears and shafts. These precision parts are CNC manufactured by one of the worlds leading automotive transmission factories. The material selected is a High Stress 20CrMnT gear steel. Gears and shafts are tempered and stress released to a core hardness of 35 to 45 Rockwell and have a surface hardness of 58 to 60 Rockwell. All gears are lapped after hardening for a smooth tooth surface that guarantees a noiseless and trouble free transmission for ten-thousands of miles. Available are the latest model gears and shafts for 5 Speed Big Twin 1994-2006. Will also fit the 1990-1993 models if replaced as a complete set including shafts. Can also be used in 1985-1989 models when you convert to a 1990-up style spline shaft clutch. All gears are separately available.