Hi . I have a problem with my 2006 650i convertible. There is a clicking sound that seems to be coming from the back or under the car. It only happens when the car is moving and gets faster and slower with the speed of the car. I have done the rear wheel bearings, front controlled arms, and repaired all the rims, at least I was told it was dow by the workshop I gave it to.. even put new run flats. Been to many workshops. . Including agmc... can't find fault. Put car on hoist and drove it so wheels could spin but no noise. Was told it could be prop shaft knuckle joint or diff joint or gearbox joint that could need greasing. I was thinking it could be that I need to replace gearbox fluid, atf, ans diff fluid. Please advise if possible. Thanks.
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