Well 88 trooper I don't think the arm does wear out. I'm with the boss in this. The shaft that anchors to the frame is the problem. You need to put your peice in a vise with the arm on it. If it really moves around after you really jerk on it maybe change it. Have you checked all your ball joints and your upper control arms. You can do this for nothing at Schwab or any alingment shop. Just be there watching, make them show you whats wrong. You decide, with me they wanted to replace both upper ball joints but I could see on one side it was the upper control arm. So I did it myself. Have your tierods checked too.

You do need to fix everything before you adjust your steering. Then do an alingment before you do the steering.

If you read the whole tread you will see that Sean said he had adjusted his steering to the max, before he rebuilt the idler. I don't blame him. But I would say fix everything else then try your steering adjustment(found on this site), I think your idler shaft bushing well last. Have one ready if you want but adjust the steering after you have done all the other things. Then do the Idler. They will tell you for nothing at the place you have it checked if you need more work. Stan