If you got the weight of the truck on it, and it still spins, that's phuked up. And unsafe to be on the road. This is when it pays to have a dial caliper to make measurements when go go back to get the right parts.
Does anybody here know if there are specs for measurements of the hole or the ball joint shaft diameter? Like, what it "should" be? That you can compare measurements too so see if if it is "in spec"? Or is there no such thing? I know it is tapered. Just curious. Seems like this is a problem we should look out for when buying parts, it would be best to have measurements of the old ones.
Or if somebody here is going to tackle this and everything goes as it should, maybe do some measuring and post it here for us to reference when somebody else has to buy parts, they know what to look for.