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Clunk when going over bumps

 
  #1  
Old 10-11-2018, 12:09 PM
Steve_F
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Clunk when going over bumps

Need help figuring something out on my truck, 2003 f250 4x4. Iíve been on here with same question and replaced several parts as per recommendations. The parts I mention as being replaced were all worn out. Still canít figure it out.

There is a hard clunk coming from right under my feet as Iím driving, I can feel it in my left foot like someone is hitting right under it with a hammer. Iíve replaced all tie rods with mood heavy duty parts, sway bar link and bushings. Shocks are brand new, rotors and calipers are brand new. Basically my whole front end suspension and steering is brand new. What do u think this could be?
 
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Old 10-11-2018, 01:54 PM
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did you check the track bar?
 
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Old 10-11-2018, 02:24 PM
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You should have bumped your old thread so we wouldn't recommend you replace the same things twice. That's what forums are for.

What is the truck doing when the clunk occurs? Have you checked or replaced motor mounts? Trans mounts?
 
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Old 10-11-2018, 02:36 PM
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Double check your shocks; that was the cause of a mysterious bump in my truck. Grab the shock and wiggle it; it shouldnít wiggle, so if it does, thatís most likely the cause

 
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Old 10-12-2018, 06:03 AM
Steve_F
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To be more clear on what I have done to try fixing this knock... all parts I mentioned were replaced and torqued down to spec. Iíve double checked to make sure nothing came loose on me. Track bar, all tie rods and tie rod ends, shocks, brake rotors and calipers, sway bar links and sway bar bushings. Had a friend help and we each took turns under the truck looking for the culprit while the other was jumping on the bumper trying to recreate the sound, which we couldnít do (speed bumps and big pot holes seem to be the thing that gets it clunking). Neither of us saw anything questionable. There is a very little bit of play in my hub assembly and wheel bearings causing a minor sway on highways. They will be getting replaced this weekend. I could be wrong, but I donít think they are the cause of the loud clunk I feel hitting directly under my foot when I drive over speed bumps. Could the wheel bearing cause this clunk? I have a friend that was a ford mechanic for years. After telling him about this and what I have already done, he said it is likely the cab mounts. What are everyoneís thoughts on it being cab mounts?
 
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Old 10-12-2018, 10:12 AM
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Not to be redundant, but did you physically remove and check or replace the track bar? It's torqued to 400 ft lbs so just checking the bolts isn't going to show a problem. I just replaced mine for the same reason, a clunk and steering sway. Once I got the old bar off and got a good visual on the bushings it was evident how bad they were.

​​​​​​Paul
 
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Old 10-12-2018, 10:39 AM
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Originally Posted by Steve_F View Post
To be more clear on what I have done to try fixing this knock... all parts I mentioned were replaced and torqued down to spec. Iíve double checked to make sure nothing came loose on me. Track bar, all tie rods and tie rod ends, shocks, brake rotors and calipers, sway bar links and sway bar bushings. Had a friend help and we each took turns under the truck looking for the culprit while the other was jumping on the bumper trying to recreate the sound, which we couldnít do (speed bumps and big pot holes seem to be the thing that gets it clunking). Neither of us saw anything questionable. There is a very little bit of play in my hub assembly and wheel bearings causing a minor sway on highways. They will be getting replaced this weekend. I could be wrong, but I donít think they are the cause of the loud clunk I feel hitting directly under my foot when I drive over speed bumps. Could the wheel bearing cause this clunk? I have a friend that was a ford mechanic for years. After telling him about this and what I have already done, he said it is likely the cab mounts. What are everyoneís thoughts on it being cab mounts?
My 2 cents from experience:
I say that I have heard cab mounts being the culprit of a "Thunk" noise before, Your best bet to check that is to place a decent sized board under a solid part of your frame in the area of the noise and carefully jack your truck up (not off the ground mind you, just with a little bit of pressure so that you can start seeing the cab go up) with the jack on the board (Note, you don't want to put your jack directly on the cab itself the localized pressure point of the jack could go though the cab floor). Once you have some pressure applied, check your cab bushings and see if there is any separation or if the cab stays taught to the frame. If it separates, that's more than likely your cause. If it's not, you might also check the trans mounts while you are down there although I if they are bad, you would more than likely hear it when your truck shifts unless you drive like Miss Daisy and let the trans casually shift between gears.
 
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Old 10-12-2018, 12:19 PM
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Check your spare tire. Sometimes it can clunk and thump if it isn't tightly held.
 
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Old 10-13-2018, 08:47 AM
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This may be a long shot....but I had a mysterious thunk that I could feel in my feet, I couldnít recreate it manually and it only occurred over potholes/bumps, etc at a decent speed. Sound familiar?

I ended up finding it by chance. It was my drivers side rear door. The catch bar for the door latch gets worn out over time and allows the door to have play. Go out and push on the door near the handle. If it makes any clicking noise at all, this may be your loud thunk.

All i I did was wrap a round or two of electrical tape around the catch where the latch hits it. Magically, the thunk hasnít returned and he door latches tight. I doubt the tape will last long, but I havenít been able to find the part online so I just need to go scrapyard hunting.

Anxious to hear if this works!
 
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Old 10-13-2018, 08:55 AM
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could try engaging the hubs to see if it goes away, i had one that rattled. that and sway bar links solved mine. good luck
 
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Old 10-25-2018, 08:56 AM
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Originally Posted by Steve_F View Post
Need help figuring something out on my truck, 2003 f250 4x4. Iíve been on here with same question and replaced several parts as per recommendations. The parts I mention as being replaced were all worn out. Still canít figure it out.

There is a hard clunk coming from right under my feet as Iím driving, I can feel it in my left foot like someone is hitting right under it with a hammer. Iíve replaced all tie rods with mood heavy duty parts, sway bar link and bushings. Shocks are brand new, rotors and calipers are brand new. Basically my whole front end suspension and steering is brand new. What do u think this could be?

Did you ever get this figured out? Did you check the door latch?
 
  #12  
Old 11-13-2018, 08:31 PM
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Curious what your findings were? My truck just started with this same issue this past week. Loud clunk hitting bumps on the passenger side. Even just a small 1" bump from the road to the concrete driveway.

I did look at my passenger side shock ( Fox 2.0) and it looks like it's blown. I am pretty sure this is going to be my clunk. Although I'm kinda pissed since these are only a year old.

 
  #13  
Old 11-13-2018, 09:22 PM
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I ended up replacing just about everything, as stated in previous comments. The final thing I replaced that solved the problem was both the front bearings/hub assemblies. While doing this I checked everything to see it was tightened and torqued to spec. I did notice that the drivers side front shock was a little loose, not much though, so I tightened it before reassembling (my clunk was coming from drivers side right under my feet). That could have been the problem. It was either that or the hub assemblies, which were rusted and looked horrible. I no longer have that clunk no matter what size bump I go over at any speed. Like you, I would also get a clunk when pulling into a driveway and going over the small lip of the concrete. Iíd def replace your shock if they are messed up, hopefully that solves it. If not, read all the comments in this thread, I basically checked them all and had no lick until I replaced the hub assemblies and tightened the drivers side shock
 
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Old 11-14-2018, 03:09 AM
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Iím willing to bet that in the end it was the slightly loose shock that was the culprit. Itís amazing how the tiniest bit of movement can cause the amount of noise it does.

 
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Old 11-14-2018, 06:31 AM
Steve_F
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Originally Posted by seville009 View Post
Iím willing to bet that in the end it was the slightly loose shock that was the culprit. Itís amazing how the tiniest bit of movement can cause the amount of noise it does.

Could be, but these were pretty shot. Im just glad the noise is gone and that truck is driving like new again

 
 


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