whirling noise on pull off (automatic) 3 series

[bushey89]

Hi.
So i went to view a 325ci last night and it was lovely condition, 1 owner FSH etc, the only thing i picked up, when it would pull off, there was this whirling noise (only way i can describe it) that lasted for about 1-2 seconds, then went.
Any ideas what this could be? Serious?

Thanks.

[E38Ross]

If it's only in 1st gear its normal iirc, it's the diff. Is it quite high pitch and rises a bit with engine revs/speed?

[E38Ross]

anonymous said:

[redacted]

I at least know it's normal in the E38, it was written in a review when they were new. That's an M52 not an M5 so may be different. I'm driving later, I'll see if I can get a video up but think it'll be too quiet to hear to be honest.

Ross.