Klunk when hitting small bumps on 21 F150 3.5EB

[DHBPhoto]

Hey there —

So, for the past month or so I have been noticing a loud klunk up front when hitting small bumps (the ideal candidate is a seem in the road — a crack or even better, maybe a lip the size of a driveay crease... so like an inch). I have taken my truck to the dealership and they re-torqued everything. Shook everything. Took me back there and we banged on everything. We can't source it. Tech heard it when we went for a drive.

Here's the build:
- Fox 2.5 Shocks w/ SPC UCAs (shocks were rebuilt 30k ago and ball joints replaced 20k ago)
- Wheels are Raptor takeoffs wrapped in 285/75r17
- Rear suspension is block removal and custom pack (about +1" height)

Any thoughts on what it could be? My gut is saying the shocks need rebuilding (again), but I seriously HATE that process. And I just got an alignment and fresh rod ties. I'm on the fence of scrapping the Fox 2.5 setup all together and buying the Eibach Pro setup. At this point, with the number of times I've rebuilt the rears and now the front a 2nd time in 50k miles, I would be ahead.

Thanks in advance!

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[Scot Maurer]

Sounds like a sway bar end link. Mine is doing it too. Had my wife stand on the running board and jump up and down making it clunk. I grabbed the end link and it stopped.

 

[Gros Ventre]

I one time had a faulty strut. After it kicked my butt for weeks I finally split for a set of Sound gears. It was only when I put them on the strut that I knew it was the problem. The strut was a new install and faulty from the factory. Like I said, identifying it just kicked my butt.

 

[DHBPhoto]

I one time had a faulty strut. After it kicked my butt for weeks I finally split for a set of Sound gears. It was only when I put them on the strut that I knew it was the problem. The strut was a new install and faulty from the factory. Like I said, identifying it just kicked my butt.

what are sound gears?

 

[DHBPhoto]

Sounds like a sway bar end link. Mine is doing it too. Had my wife stand on the running board and jump up and down making it clunk. I grabbed the end link and it stopped.

have you replaced it.? Did it fix it?
I’ll crawl under there tomorrow and bang around with a mallet.

 

[Gros Ventre]

what are sound gears?

Sorry, should have been clearer. They are strap on sound sensors that transmit to a control unit. This allows you to monitor a location(s) while driving.

 

[DHBPhoto]

Sorry, should have been clearer. They are strap on sound sensors that transmit to a control unit. This allows you to monitor a location(s) while driving.

that’s cool! I’ll have to look into these… could honestly be my undoing, but still, cool concept.

 

[Hogan]

Also called Chassis Ears.. I have a Set at work for this exact reason to find clunks over bumps.

https://www.amazon.com/Automotive-Electronic-Stethoscope-Headphones-Sensitivity/dp/B0BQ72BNBY

 

[Gros Ventre]

Also called Chassis Ears.. I have a Set at work for this exact reason to find clunks over bumps.

https://www.amazon.com/Automotive-Electronic-Stethoscope-Headphones-Sensitivity/dp/B0BQ72BNBY

That's different than the set I have but good for what you may need. Like I said that clunk I had kicked my butt. I just couldn't believe that a brand new strut was the problem... But it was.

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