[diesel_mercedes] diagnostic help

 

My 300D is making a loud thumping noise from the right rear of the car. It first started on the free way. When i pulled off the road to look under the car there was nothing amiss. When i got back on the road the noise took awhile to start back up again. The  back right CV boot does have some grease on it but the boot it self is in good shape. Also it's not a clicking sound like you hear from the front CV joint it's more of a thumping sound.

any ideas 

Thanks  

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