Hello, a low pitch wine starts at around 30 km/h and is related to wheel speed. (rpms, clutch position, gear selection, steering or braking have no effect on the noise) It gets a little higher in pitch as speed increases and the loudness fluctuates a little. Not really loud though (ie. if the blower fan is on 3 it's heard to hear.) The noise seems to be coming from the the gearbox or under the front seats, but is hard to pinpoint. After about 15 minutes of driving, it improves by about 50% so that sometimes it's not there at all at any speed. Transmission functions well with all gears shifting smoothly.

I changed the transmission fluid which helped somewhat, but was disappointed to find some metal filings on the magnetic drain plug.

Is this transmission on it's way out?

Drive shaft need greasing? (I didn't see any grease nipples)

Other comments or suggestions?

Thanks.

That sounds like your driveshaft support bearing is going out. Welcome to the club. Mine howls off and on too. I have extended the life of a couple of these by prying back the rubber boot and squirting in Release-all, a light oil in a spray can. WD-40 might be too thin, but I think a motorcycle chain lube spray would be good. When the weather warms up I'll make the permanent cure.

Marten

Where exactly is this bearing? What's involved in replacing it?

It supports the rear end of the Front D-shaft half. It's encased in a large rubber cushion (bushing), which is held in place by a bracket bolted to the floor structure.

Replacement involves removing and separating the 2 halves of the shaft so the old bearing can be pressed off, and the new one pressed on.

The Bentley 240 manual has a good write-up and pictures. The Haynes is OK too. Both manuals say that the old bearing can be driven off with a "drift" and hammer -- and the new one tapped back on. I did one that way once.
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Bruce Young
'93 940-NA (current) — 240s (one V8) — 140s — 122s — since '63.