I have a 1967 MF10 with hydro-speed transmission. This tractor has been a hobby of mine for the last 3 years, working on it whenever I had an hour to spare. I now have it running relatively well, with one BIG exception - I can't shift the transmission with the engine running without clashing gears. If I engage any of the 5 gears before I start the engine, it runs in that gear with no problem. To shift gears then, I have to turn the engine off, shift, then restart. I have already changed out the fluid, replaced the secondary belt, lubed the variable sheave, adjusted the tranny split drive pulley, variable linkage and brake. I'm hoping the fix is simple...anyone ever had this problem before or have any suggestions? Thanks in advance.