We had a 00 Ranger step side 4wd. Unfortunately, it was pretty trouble prone its whole life. Some areas of repeat repairs on ours were upper/lower ball joints, rocker arms, front suspension components. Body hardware like door handles, hood release, tailgate. The 4wd system eventually just stopped working. Electrical problems popped up every now and then, like alternator, starter. The engine and transmission were always strong even up to the very end. What did it in finally was rust. The brake lines were rusting and couldn't be repaired without major $$ and finally, one of the rear springs popped up through the bedliner, tilting the rear at on odd angle. That's when we stopped driving it. Now mind you, it was 13 years old at the time and 189,000 miles on it.