Shop now for Mainshafts, Mainshaft Gears, and Input Shafts specific to 1973-1991 Chevy & GMC 4x2 and 4x4 Trucks with SM465/CH465 4 Speed Manual Transmissions. In stock. Quick shipping.
GM SM465/CH465 4 speed manual transmissions in 4x4 trucks all used a 10 spline mainshaft (rear output shaft) through 1980. In 1981, all models except K30/K35 one ton trucks with NP205 transfer cases changed to a 32 spline shaft. Four Wheel Drive One ton trucks continued to use the 10 spline rear output through 1984. All 1985 to 1991 SM465/CH465 4x4 transmissions have 32 spline mainshafts.
