You need a REAL strong 1/2 inch impact to remove most upper ball joints in a car that had them in there for decades.
BUT.
If you worked at a heavy duty truck repair shop that uses 3/4 inch air guns, ball joints come out easy peasy.
Those impacts have a lot of kick to them.
Recently I removed a pair of upper ball joints (large) on a 1969 Polara, took the control arms into work and locked them in a vice, 3/4 impact, wonka wonka wonka they came out, wasn't easy but they kept moving.
