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Old 08-20-2020, 12:54 AM #16
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Did you go over your welds that you did on the front clip r&r?
Maybe the hit was so hard it broke some of the spot welds?
Could be that everything is tight when the truck is on a level with no body stress.
If you were to dip the front passenger side like you were going through a pot hole or dip, that would put that side under stress and maybe expose a broken weld?
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Old 08-22-2020, 03:05 PM #17
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I jumped on the bumper and it doesn't do it so can't tell. Disconnected the sway bar, it isn't that. Just replaced the lower ball joint and it is still doing it so it isn't that. Maybe the upper ball joint? I'd be surprised if it took the impact since the bump stops would absorb the force and transfer to the lower ball joint.

I got someone to drive backwards slowly in the parking lot and slam on the brakes beside me and it makes the noise. It sounds like it is coming from just above and behind the wheel. That could be an echo off the wheel well from somewhere else though. A significant hollow sounding suspension rattle, like if you were standing beside it on the street when I went over some bumps you'd definitely hear it and think there is something wrong.
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Old 08-22-2020, 04:08 PM #18
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Maybe something metallic dropped into one of those holes in the closed section part of the frame?
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Old 08-22-2020, 04:24 PM #19
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Upper control arm bushings shot maybe?
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Old 08-22-2020, 08:59 PM #20
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I had to take my struts and sway bar off then lift it in the air and start prying with a giant bar to find it was a lower control arm bushing.
Make sure the dent in the trans pan doesn't block the trans from sucking up oil, I think it picks up off the bottom(??)
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Old 08-22-2020, 09:48 PM #21
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Quote:
Originally Posted by Wedgy View Post
I had to take my struts and sway bar off then lift it in the air and start prying with a giant bar to find it was a lower control arm bushing.
Make sure the dent in the trans pan doesn't block the trans from sucking up oil, I think it picks up off the bottom(??)
Did it make metal on metal clanging? I do see that the bushing has a small tear in it, from what I can see of it, but I'd be surprised if it made that much noise.

Tomorrow I'll be removing the LBJ and strut again to swap the originals back in so the upper and lower arms should be free to pry on.
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Old 08-23-2020, 02:23 PM #22
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Are you 100% sure it's coming from the front? Check your upper bushings on your rear shocks. If they rot out they make an awful metal on metal sound when going over bumps.
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Old 08-23-2020, 08:32 PM #23
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Yes for sure the front. I just pulled out the strut and LBJ again and the control arms were free. They seemed fine. Tie rod seems fine too. I think I can rule out the front suspension. Differential seems OK. Amazing how it can sound like the front end is going to fall off when you hit a bump then everything's tight when you go underneath.
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Old 08-23-2020, 08:38 PM #24
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Can you simulate a pot hole hit on the lca/uca with a rubber mallet/plastic face hammer? Still quiet?
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Old 08-28-2020, 01:27 AM #25
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I brought it into the shop and it took the guy 2 hours to find it. It was the body mount behind the front wheel. The bolt was loose. I guess the guy who straightened the frame loosened it and forgot to tighten afterwards. It wasn't rattling until this impact which I guess shifted things and made it start rattling.

Now it's nice and tight over the bumps, ready for my trip next week.
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Old 08-28-2020, 01:30 AM #26
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Quote:
Originally Posted by sleepydad View Post
it's always something obvious once you find it but it has nothing to do with the suspension. it's because you have a preconceived notion that it's the suspension and your just overlooking what is really busted/crack?
You win the prize. I have a rusty old sway bar for you, should you accept. Shipping may be prohibitive.
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Old 08-28-2020, 01:43 AM #27
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That sounded like a doozy. Glad you got it figured out!
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