Got the Ram Clunk. Narrowed down to the driveshaft?

[Kumunyo]

Hey y'all. I'm a new owner of a 2020 Ram Rebel and it has the ram clunk whenever I accelerate/brake. This symptom however is only reproduce-able when (seemingly) the entire undercarriage was wet, when the truck is dry it makes no noise, no clunk, nothing.

This clunk seems to occur when weight is transferred back and forth on the truck. It'll clunk when coming to a stop, clunk when I take off. Clunk when I start reversing, clunk when I switch to drive and drive off. The severity of the clunk is directly proportional to the wetness of the undercarriage.

After reading countless "Clunk" posts that never fully answer my question other than "Idk it could be a lot of things just rebuild the entire truck" I finally found a way to narrow it down myself. I came home from work when the truck was completely dry and sprayed one component at a time with a bottle of water and the FIRST part I sprayed was the slip yoke. Nothing.

I then, confused, sprayed the end of the driveshaft that goes into the rear differential. Clunk.

I let the truck dry off. No Clunk.

Spray the end of the driveshaft. Clunk.

No idea what this means for parts or what is wrong but it is a step in the right direction. Does anyone have any ideas??

 

[Reverse]

Thanks for testing that for us. My experience has been the same: clunks when wet. And also seems to happen when it's cold outside. Goes away after driving for a while. I would add that changes in direction (turning left or right), however slight, also bring about the clunk on my truck.

 

[Kumunyo]

Thanks for testing that for us. My experience has been the same: clunks when wet. And also seems to happen when it's cold outside. Goes away after driving for a while. I would add that changes in direction (turning left or right), however slight, also bring about the clunk on my truck.

No problem. I know these trucks fairly well under the hood but when it goes past the transmission I have no idea what I'm doing. I'm not sure why wetting the driveshaft/rear diff would cause clunking. Very strange.