if it is the OE rag joint that has never been replaced, then yes, it will help a lot, as long as the front end parts are good. It was a big help in my truck, anyway. If you remove the plastic cover over the rag joint, and have someone else turn the wheel back and forth while you are looking at the rag joint, you should be able to see the play in it.would replacing just the rag joint in my truck me good enough to fix some slop? its a 2500 with 3in body lift, and i didnt want to spend 200+ and possibly cut/weld something just to fix it. its not a daily, and it will see some light off-roading.
or try the flaming river u joint?