OS Giken Nissan 350Z and Skyline 350GT 6-speed close ratio gearset
OS Giken close-ratio gearsets offer greatly increased gear strength, along with closer gear ratios to suit racing applications. The retention of normal synchromesh parts and a helical gear design means the gears are still almost as quiet as a standard gearset, so this is an excellent upgrade for street-driven vehicles too.
OS Giken ratios: 2.783, 1.961, 1.507, 1.217, 1.000, 0.8112
Standard ratios: 3.794, 2.324, 1.624, 1.271, 1.000, 0.794
This gearset is designed for the FS6R31A gearbox from models built after September 2005