My 5-speed seems fine at 200K mi.+
I sometimes think I might be hearing a vague hint of shaft bearing whine, but I do hope it is my imagination...
Running Redline MTL made a big difference on cold days.
The shifter mechanism currently has significant slop in it, which detracts from the driving experience.
I have the parts, just need a free weekend day...
1986 300E 5-Speed 240k mi.