Car Owners Hub UK - Built by Drivers, for Drivers

My 1991 BMW 330D Touring is malfunctioning.

From behind the vehicle, there is a deafening screech that sounds like a Chinook helicopter. At speeds of sixty miles per hour or above, the sound becomes audible.


The noise also comes in when I apply power when on a left-hand turn.

A mechanic has already looked at the vehicle. I had the wheel bearing on the front passenger side replaced since they thought it might be a wheel bearing. In addition to having the differential and rear bearings serviced, I had the failed rear shocks replaced.

Feb 2025 was the date of the differential replacement.

Even so, you can still hear the sound.

I get that the traffic noise can make it difficult to hear.

I would really value any assistance.

Perhaps wheels need to be adjusted? Anything more besides shocks that goes into the suspension?

The noise was present both before and following the time I had the wheel alignment taken care of, which was when I got two new tires for the back.

A polyurethane connector, a center bearing, or a universal joint on the shaft of the propeller.
It could be a front tyre that has delamination.


You replaced the diff for what reason?

There was a deafening screech as the bearings failed.

100% sensor and wheel bearing at the same time; I believe I came up with the term "chinook" when this first occurred to me (around 2013 or 2014). Make a drive, spray water on both discs, but you'll quickly tell which one it is.

With the goal to detect any accumulation of heat, I invested in a temperature gun.