the U joints are the same from 1948 to 1972 3/4 tons. My 48 3/4 ton used the 331 Precision for both joints... I believe both together cost me about fifty bucks. All you have to do is bring one of the u joint caps so they can match it up because there are two different options. I believe its either the 331 or the 269 or is it 369... well anyway its something 69