I love the 73-87(-91 suv) gm C/K trucks. I had a rcsb 77 chevy K10 Cheyenne. I want another but a C10 instead.
C- 2wd truck, K- 4wd
10/25-20/25-30/35 is half ton, quarter ton and one ton. the name on the side(such as my cheyenne 10) is thr trim level and weight. the trucks until the 88+ were just C or K.