The K5 Blazer was available with a 305ci (1981–1987), 307ci (1973 only), 350ci (1973–1991), or 400ci (1973–1980) small blocks, the 250ci Inline-6 (1973–1984), or the 6.2L Detroit Diesel (1982–1987). Starting in 1981 the NP208 transfer case was used. From 1988 to 1991 the NP241 transfer case was used with some axles. 