I have a 80 300sd with a 722.10 (4 bolt) transmission.. i drove in the fall no issue.. sat over winter.. in spring it started to flare between 2nd/3rd gear shifts.. RPM jumps about .5-1k.. and the rest of gear works fine.. since i had similar issue on w123.. i changed the oil/filter and it fixed the issue on it.. so i did the same thing on this changed oil/filter.. i drove few days almost no issue.. only flared onces.. and now when car is warmed up it only flares at 2nd/3rd gear.. any help would be awesome.. i tried to find info on forums but most of them are for the newer model, and K1 spring kit can fix those.. i didn't find any for this transmission.. if for a chance i mist a thread about this already can some send a link to it.. thanks in advance.