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Old 01-18-2013, 06:31 PM   #1 (permalink)
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Thunk sound from rear suspension, thoughts?

Hey gang, this noise is starting to drive me mad so I'm gonna finally try to figure out what it is. When going over a bump, I get a sharp thud in the rear like something is loose. It seems to happen when the suspension unloads. It doesn't happen over all bumps. For example if I'm going slow over a good sized bump I get no noise but going fast I get it every time.

It has plagued me since putting in the 3" SAW lift. I also replaced the sway bar links about the same time so the bar should be back to near stock angles. Every since then this has been happening. I have triple checked that nothing is loose or out of place but can't figure it out. Did the lift change the geometry to a point that this is just what happens kinda thing or am I just missing something?
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Old 01-18-2013, 06:50 PM   #2 (permalink)
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Re: Thunk sound from rear suspension, thoughts?

One time I had a "Thunk" back there. I was 90 miles out in the Mojave when I finally found the culprit. One side of my panhard bar lost it's bolt and it was bouncing off my BozTec diff skid.

Thank's again John
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Old 01-19-2013, 06:43 AM   #3 (permalink)
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Re: Thunk sound from rear suspension, thoughts?

The lift didn't change the geometry. Go back and put a wrench on every bolt you touched previously. Did you tighten your upper shock mounts a little more after putting the truck back on the ground?
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Lifting does not remove the body mount from the path the tire takes up and down in the wheel well. Lifting does not move that path around the body mount. Lifting only sets the starting point of that path partially below the body mount giving the illusion of clearance. Only alignment and/or body mount chop can increase tire clearance between the body mount and tire.

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Old 01-19-2013, 06:46 AM   #4 (permalink)
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Re: Thunk sound from rear suspension, thoughts?

Shouldn't be your link mounts otherwise you'd notice the axle steering your vehicle when you got on and off the gas. I'd look at your shocks, swaybar, and panhard
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Old 01-19-2013, 08:31 AM   #5 (permalink)
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Re: Thunk sound from rear suspension, thoughts?

Oh, Check to see if your bottle jack is snug. If it is even a little loose it can make the described noise.
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Old 01-19-2013, 09:32 PM   #6 (permalink)
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Re: Thunk sound from rear suspension, thoughts?

I am having the same problem. It sounds like metal hitting metal, and only happens when I go really fast. It's very annoying. I have the icon stage two, any guesses? There are times when it sounds like its coming from the front. I really can't pinpoint it.
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Old 01-20-2013, 11:53 AM   #7 (permalink)
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Re: Thunk sound from rear suspension, thoughts?

Bottle jack is very tight so that's not it. It almost sounds like it happens right AFTER the suspension absorbs the bump. I was unsure how tight the shocks should be, the instructions warned that too tight could cause problems so I tried to follow their instructions. I believe it was a turn or so after the washer stopped moving. Are they too loose? I never touched the panhard bar so I can't imagine that's the culprit. I did remove the sway bar mounts and replace the bushings with graphite impregnated polyurathane, could that be my problem?
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Old 01-20-2013, 11:57 AM   #8 (permalink)
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Re: Thunk sound from rear suspension, thoughts?

I'd go around with a wrench and make sure your fasteners are all tight. Starting there will be the first step towards identifying the problem
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Old 01-20-2013, 01:34 PM   #9 (permalink)
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Re: Thunk sound from rear suspension, thoughts?

Quote:
jays0n previously said: View Post
Bottle jack is very tight so that's not it. It almost sounds like it happens right AFTER the suspension absorbs the bump. I was unsure how tight the shocks should be, the instructions warned that too tight could cause problems so I tried to follow their instructions. I believe it was a turn or so after the washer stopped moving. Are they too loose? I never touched the panhard bar so I can't imagine that's the culprit. I did remove the sway bar mounts and replace the bushings with graphite impregnated polyurathane, could that be my problem?
I'm sure the shocks are fine then. You're right, don't over tighten, the stem mount can bend under dull compression if the bushing can't move enough.
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Lifting does not remove the body mount from the path the tire takes up and down in the wheel well. Lifting does not move that path around the body mount. Lifting only sets the starting point of that path partially below the body mount giving the illusion of clearance. Only alignment and/or body mount chop can increase tire clearance between the body mount and tire.

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Old 01-22-2013, 11:44 AM   #10 (permalink)
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Re: Thunk sound from rear suspension, thoughts?

I'll be warming it up in the garage tonight after work and going over all the fasteners again. The last time I did this I didn't find anything loose but will go through it all again. Has anyone ran into issues with the back door rattling at all? I really have no idea what it could be, this is driving me nuts!
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