【正】 According to the statistics, there are about 90 auto clutch assembly and its main parts manufacturers now in China. Before 1985, the main products of these clutch plants were helical spring clutches for truck OE and service markets. Their production scale was limited and facilities and technological process level were low. Since 1985, Changchun No.228 Factory, Clutch Plant of Nanjing Automobile Works, Shanghai General Plant of Auto Clutch