The NP205 was a heavy-duty, gear-driven, extremely durable cast-iron transfer case used in Chevy, Ford, International and Dodge full-size trucks. The Chevy versions were referred to as NP205C. They were installed in Blazers, K10s, K20s and K30s from 1966 through 1984.
The Chevy versions of the NP205 transfer case used eight bolts for added strength. The bolts form a racetrack pattern.
The NP205 was manufactured with four different input splines. From 1966 to 1984, a 10-spline model was available and was most commonly used with the SM465 transmission. From 1971 to 1979, a 27-spline model was available and used with the T350 transmission. The NP205 also came in both a short and long 32-spline format, which was usually attached to a T400 transmission.
The NP205C was configured with two front output splines. A 10-spline model was manufactured from 1971 until around 1977. A 30-spline model was produced from 1977 until 1984 (in Chevrolets). The 10-spline model came with a 1310-series yoke and the 30-spline model used a flat flange. The transfer case featured a 32-spline, rear output shaft and came equipped with a fixed yoke.
