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Hi,
I’m not a 940 person but off hand I would have to say it’s a driveshaft support bearing gone super dry! The bearing is really rusty and sure as heck doesn’t like being turned backwards.
I know it sounds like a reach but roller bearings usually screech long before this going forward.
If it is the bearing or the supporting member that supports everything under there then there is something rubbing.
Sounds loud enough to be sheet metal in this case?
There should be a shiny spot someplace with this scenario?
Should have to be around the driveshafts output end from the transmission. That would be the tail shaft bearing or bushing in older automatic 240s. It’s inside the rear housing.
I don’t know for a fact but they can be replaced from the outside or I would hopefully think so!
I only own one 240 with an automatic transmission.
I don’t understand why you are doing all the turning of the steering wheel but the should add drag to the front end of the car or load through the drive shaft.
If the pitch changes with the turning of the wheel or only when they are in extreme lock to lock position then that puts the noise related to the front end of the car.
If the wheel bearings are super loose then the wheels are shifting and the brakes discs are raising hell with the calipers and possibly a dust/water shield.
Without a directional source, I cannot draw up any other visual explanations in my mind.
Maybe a video from outside the car while you are backing up and the camera and microphone 🎙 going along outside with the car would be more helpful to other 900 owners.
Phil
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