Well ;

If it's the throw out bearing it'll make noise when you step on the clutch, even in neutral .

That it makes noise in every gear says *maybe* the cluster shaft bearings are kaput .

Don't be in a hurry to yank it out, drain it into a super clean pan and see what's in the oil .

Golden colored glittery stuff or silt is the synchronizer rings, unless they break they rarely make noise .

Steel colored SWARF or silt means the tranny is or is close to the end .

I have never done one of these trannies but in general I find manual trannies to be very straight forward in repair .

If there's just one bad bearing (what I *think* it sounds like) probably caused by the bad hydraulic clutch it may well be an easy repair : change every single bearing in it and new synchro rings, set the lash / end float and even if it whines it should be good to go .

Of course you're going to add a small magnet to the fill and drain plugs no matter what you find .

Sadly I see more than a few 240D's with the manual box still in them being crushed for scrap after the lazy owner makes it like a pig sty inside them junks it when it fails to start .

Point being there should be an affordable used tranny out there for you or, what I'd do : make one good one out of at least two plus new bearings and synchros .

Keep us posted please .

__________________
-Nate
1982 240D 408,XXX miles
Ignorance is the mother of suspicion and fear is the father

I did then what I knew how to do ~ now that I know better I do better