Sorry, I know it's a 2wd, but figured someone here might know. I need to do ball joints on my '86 c10, and the parts books are giving some spurious answers. Some list 2 different lower joints, 1 being 'oversized'. Some only list 1 lower joint The GM book lists 2 different numbers for c10, but doesn't say what the heck the difference is. Anyone know why the 2 different numbers for the lower joint? Do these things have a bad history of reaming themselves a bigger hole in the lower a-arm or something?