The manual tranny on my 240D 77 with about 350K was begining to feel a bit tired, slight grinding particularly when cold, shifter had lots of play etc.
Assuming that this thing needed an overhaul I priced the total cost at my repair shop, the mechanic estimated somewhere around $1k or perhaps a bit more, to replace all the synchronizers.
Last week I had my 240D in the shop for its big brake job, asked the shop to replace transmission bushings and they did, the mechainc said that the bushings were essentially gone.
The transmission now feels like a brand new, precise, no slop, shifts beautifully, no grinding, I am just amazed at this thing, it drived like a new car.

Vahe
240D 77 350k