Noise under the car

[Unimog 406]

Broken spring, I recall hearing of this some time back
Good luck Graham

 

[Tom109]

I've experienced a similar deep knocking noise when driving over uneven soft sand. Have not heard it in a road driving environment.

I’ve heard/felt it on soft sand as well. I thinking the driveshafts

Same, last weekend 3 hours of sand tracks and same knocking. Strange for soft terrain.

 

[Logsplitter]

Have you checked the tie rod. Does it twist easily. My did and used to clunk on one of the swivel joints when articulating off-road. It’s fixed now but don’t know what the dealer did to fix. If you have diff guards make sure they are not interfering with the steering damper when fully loaded or max articulation

 

[Wueste]

I have an appointment at a local garage on Monday. Then I'll have a look under the car. I also have an underbody protection from Rival, maybe the noises come from something hitting or rubbing against it.
I will report back to you.