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Front bumping sound in 2000 Ex please help
I purchased a 2000 7.3 Ex with 93k miles and 4X4 Limited about 4 weeks ago. I knew it needed ball joints, windshield and Rt passenger door lock actuator. I replaced the windshield and have a slight whistle (I think I know what it is), replaced the actuator (that is working well) and had Spiner professional upper and lower balljoints installed as well as new shocks. I still have a bumping sound in the front when I drive over bumps. The steering is much better with the new balljoints and I don't feel the bumping sound in the steering, but the bumping sound is bothering me. I took it back to the mechanic to take a look and he isn't sure what it is. The sway bar can slide a little in its bushings, but not enough to make the sound. The sound comes from under both of the front floor pans at different times depending on the road. The stop bumpers are gone and I am sure the front springs are sagging. The front rear leaf spring mounts are facing rearward and about 3/4" away from hitting the frame. I think this could be the area the sound is coming from. I don't see a dent in the frame from them hitting, but there is a small mark. Please help with any experience on this bumping issue. This is my first post and my first diesel.
I was planning on updating the front springs to at least V code (see I did my homework here), or maybe X, not sure, but want to find the problem first. I would like to eventually install at least 33' tires. The truck has a Hypertech programmer III installed. Gas mileage around town says 19 and I've gotten 27 on the highway when cruising. I am not sure if it is correct though. I am tossing around a new air intake and maybe a better flowing muffler.