[61K10]

your u-joints should be the 1310 ones, the 1350 was used on the front d/s at the trans. 4sp sm420 and i think the heavy duty 3sp. ck out rockauto.com. go to their catalog,click on chey, year1964 c10 230eng. they have pictures of just about everything and the specs. you don't have to buy from them, but a good reference to ck parts.