Date registered: Jan 2007
Vehicle: 1962 W111 220SE Coupe
Location: Cloud City, OR
Mentioned: 1 Post(s)
Quoted: 8 Post(s)
The diff is probably leaking from age and will need resealed. On my W111 I had to have two leaks fixed, wasn't cheap due to labor but if you have the know-how to remove and reseal (parts are readily available) then it won't cost that much.
The transmission is usually jerky, especially noticeable on the last downshift, when the MFI (mechanical fuel injection) system has been messed with. Most people have no idea what they are doing when they start turning knobs trying to adjust the system, but they rarely go off spec, it's other maintenance jobs that have been neglected. Point being, once the MFI is adjusted the relevant parts that control the transmission shifting fall back into order and it will smooth out. Something the simple adjustments needed to fine tune the MFI will either throw a transmission out of sorts or put it right again, depending on how the rest of the system has been set up (correctly or not). Join the W113 page linked to in the earlier reply and they will have the process for moving downstream to get the system working. I realize you aren't going to go in and try to repair every Pagoda you consider for purchase but if that is the only transmission issue I wanted you to know it isn't a fatal one and usually easily remedied.
The Coupe Group (W111/112 coupes and cabs)official website
The Coupe Group on Facebook
"Too many people are working at jobs they hate, to buy things they don't particularly want, to impress people they don't even care about." --Dr. Deepak Chopra