[Tx Firefighter]

Not true. You have to use whatever ball joints fit your drop spindles. There are 63-70, 71-72, and 73-87 flavor of dropped spindles on the market.

Now, there is one dirty company that comes to mind that sells 73-87 drop spindles for early trucks and tells you that you need to swap your ball joints and steering linkage to 73-87 stuff to match. That's just ghetto of them and no longer the best option. That was the path before Early Classic started making true bolt on spindles for the earlier trucks, back when 73-87 drop spindles were the only ones made.

Nowadays though, if you order spindles for 63-70 trucks, you can reuse all of your steering linkage and 63-70 ball joints and not have to swap everything over to late model stuff, saving real money in the long run.