My truck has developed this squeak. It sounds like it may be the leaf spring bushings. It is there when I hit a bump, or if I jump on the rear bumper, on the passengers side, but it is hard to pin point. My truck is a 97,ext. cab, 2 WD, 5.7 L with factory tow package and has 215000 miles. Has any one else have this happen to them ? I have looked up the replacement bushings, but I hate to pull the springs if that's not the issue. SO I was just wondering how common this is.