Strange rotary vibration

copterdoctor

copterdoctor

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Hey all, just wondered if anyone has had similar... A4 3.0 TDI quattro B8, just started to have a weird rotary thumping noise, like driving over tiny rumble strips. Noise starts about 30mph and the frequency increases with speed, but the volume of it seems to stay constant. No change with turning left or right and I can't seem to pinpoint the exact area where it's from????
 
Wheel bearings quite common on the b8, quite easy to check for play. Could also be bearing on prop shaft in middle. Probably not front drive shaft joints if it doesn't change with turning, buy maybe rear drive shafts. Or worst case rear diff but that is normally more of a whiny noise.
 
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Or being quattro if there a mismatch in tyre sizes or a big difference in wear between front and back then that can cause issues.
 
Don’t overlook the tyres. Had some wheel bearing type noises n mine. Turned out to be the tyres, changed them and the problem vanished. I was convinced it was rear bearings though.
 
Cheers for that, the tyres are all relatively new and were all changed together so doubt it's them.... The noise seemed to start after the weekend where I'd been towing a trailer for about 400 miles and a heavy ish roof box. Nothing until about 36/37 then disappears behind engine and road noise about 45+ A strange one
 
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