BMW E46 323 - Whining/Howling noise from drivers side rear
Over the last month I have been experiencing a slight whining/howling noise coming from the rear drivers side at around when I shift into 4th gear at around 30mph. This noise then goes away once I am in gear and drive on. Also I have tried coasting at around 30mph and the noise is still audible. When I de-accelerate to 30mph the noise is audible too.
At first I thought it might be tyre noise, however I have rotated my rear tyres with my front tyres and there has been no change. This then led to me thinking it could be a differential issue, so I changed my diff fluid using Redline Synthetic Gear Oil (75w140) and put in liqui moly gear additive in the hope it would quieten the noise, however this has not worked.
Could it be something further with the diff like a bearing wearing out or gearbox/clutch related?
Last edited by vinzchau9; 09-04-2016 at 02:27 PM.