[DG330]

Hi,

I have a slight whine on acceleration from 15/20mph upwards until road noise takes over. nothing noticeable on deceleration.

It sounds like it's coming from the rear. Car is 90k plus.

Front diff oil has been changed by bmw during a timing chain replacement.

Going to be changing gearbox oil, transfer case and rear diff oil in 2 weeks.

Gear box oil will be ZF with filter/sump etc and diff febi 75-85 gl5 OE quality and transfer case bmw DTF 1

Any idea what this is? Any tests I can do?

Thanks