What is this?

[smgilles]

I had Deavers put on and could hear this “clunking” when going slow over bumps that sounded like it was coming from the box, but I chased it down to this and it appears loose.

I have no idea what it is or it’s purpose. See photo...

 

[zemuron99]

Want to help out. Is that drivers' side or passengers' ?

 

[EricM]

Mass damper. Just a big weight to fix some NVH issue they found during development.

Take it off if it's making noise. It's defeating it's own purpose.

 

[CoronaRaptor]

Spray some fluid film under there, on the frame etc. Getting a bit of surface rust I see.

 

[smgilles]

Want to help out. Is that drivers' side or passengers' ?

driver's side only.

 

[smgilles]

Still trying to solve this and wondering if anyone else has any insight. It was not the mass damper as I thought/hoping. I sprayed it real well and it's quiet. I believe it's the driver's rear shock (I did shock exchange) same time I added Deaver's. When I removed the shock I could not reproduce the "clunk", which tells me it's not the Deaver's. It's easily reproducible by slightly pushing up and down on the rear of the truck.

I only hear it going slow over bumps or hitting large cracks in the road as slow speeds. As stated previously, I pulled the shock and then retorqued the bolts to 75 ft/lbs when putting back on. Of course the sound came back immediately. I pulled the shock guard and it made no difference either.

Thoughts?