When removing the lower ball joint the press would not do it by itself for me. I had to tighten it up as much as possible, then smack the cup pushing on the ball joint with a hammer to get it to release. And please remember to remove the ring clip first!
The OEM upper control arms have to be replaced to get a new upper ball joint, but some parts manufacturers make a new upper control arm that has removeable ball joints. It may be a little more up front, but you have to decide just how long you are going to keep your Trac. And check for grease fittings! One of my new upper control arms had a ball joint that was not drilled for a grease fitting.:angry: