Suspension noise - Ford Powerstroke Diesel Forum
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  #1  
Old 09-28-2013, 03:13 PM
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Suspension noise

Well I searched the other similar threads and they don't seem to be exactly what my issue is so here goes...

When driving at slow speed over a slight washboard road or hitting some bumps in the road at higher speeds there is a clunk under the truck. It seems to be coming from the rear but I'm not positive about that since noise can be deceiving. The clunk will rattle as fast as the truck hits the washboard bumps...kinda like a machine gun pop.

It is a 2000 F250 7.3 4x4 extra cab. I have replaced the sway bar bushings front and rear and the shocks were replaced a year ago. The swaybar bushings were bad and replacement helped the noise at the time. Now it's back again but worse.

I have done a visual inspection on everything I can think of. Exhaust system, trans mount, shock mounts, swaybar bushings and the leaf spring bushings look OK. Even the spare tire is tight.

Can anyone point me in another direction?

Thanks guys,

Shane
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Old 10-03-2013, 05:39 PM
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OK HERES AN UPDATE.

Shot WD40 on ALL the leaf spring bushings, thinking they are the problem. NO JOY!

So now what...just drive it until something falls off or breaks?

It's the wifes truck anyway...oh well.
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Old 10-03-2013, 08:20 PM
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sway bar links or maybe the cheap ford hubs?
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Old 10-05-2013, 07:23 AM
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Not as far as I can tell. I replaced the swaybar bushings a few months ago , so they are new and in good shape. I did a check of the hubs and ball joints yesterday. No play there either.

Wondering if a dry driveshaft slip yoke would cause the noise. There is no play in the shaft or u-joints though.

I may just have to ignore it until it gets really bad to the point of something actually breaking. The wife hasn't said anything lately and it's her daily driver. Maybe if she THINKS I'm working on it she'll shut up.
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Old 10-13-2013, 10:14 AM
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Update.

Dropped the driveline and lubed the splines on slip yoke. Driveline clunk is now gone but suspension noise is still there.

It's looking like the leaf spring bushings are the culprit. Not looking forward to that project.
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Old 10-13-2013, 10:52 AM
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Have you checked to make sure the bolts that hold the shocks on are all tight. I would lay under the truck and physically push it up and down and see if you can recreate the noise and see where it is coming from.
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Old 10-14-2013, 11:21 AM
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Yep, thats one of the first things I looked at. Plus they are new shocks too.

I can't move the truck enough up and down, to make the noise. but when I drive it out on the washboard road by our house it moves the suspension enough to make the noise.

I finally got under the truck with enough light to see where the shackle bushings have small cracks in them, a sign they are breaking down.

So I need to call up my mechanic (me) and let him know he has yet another project to do.
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Old 10-14-2013, 01:38 PM
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Hmm, I know how you feel bud. Any type of noise whether it be a rattle or squeak or anything unusual absolutely drives me crazy. My truck used to make a jingling noise when I went over any kind of bump and I practically took the front of the truck apart chasing it and it ended up being one of those castle nut cap things that goes on top of the drivers side tie rod nut jingling.
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Old 10-30-2013, 05:45 PM
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Quote:
Originally Posted by clovisb31 View Post
Yep, thats one of the first things I looked at. Plus they are new shocks too.

I can't move the truck enough up and down, to make the noise. but when I drive it out on the washboard road by our house it moves the suspension enough to make the noise.

I finally got under the truck with enough light to see where the shackle bushings have small cracks in them, a sign they are breaking down.

So I need to call up my mechanic (me) and let him know he has yet another project to do.
Do you have any updates to your problem?

I seem to have the same issue. I used to think it was a front end noise, but I drove over a few speed bumps at the local Mall and it is definitely a noise caused by the rear suspension.

Chris
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Old 11-01-2013, 11:00 PM
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Have you cranked down on the u-bolt nuts for the axle spring pack?
I would also look at all the fuel tank bolts and nuts.
I occasionally squirt motor oil into the leaf springs to help them slip on each other. There are Teflon shims on the ends but they get dry and can cause a chatter. The suspension will soften a bit to with oil on the springs.
Might check the bed bolts too.
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