MOST dealers don't attempt manual trans overhauls(we do)! On the newer generation MB transmissions there are tapered bearings that require precise set-up instead of ball bearings. Several special tools required! Cost of repair is higher than REBUILT exchange in a lot of cases
And of course less than 0.5% of MB's came with manual transmissions.

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MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
Mercedes Benz Star Technician (2 times)
44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)
Retired Moderator