I have77 with a 4-speed transmission. I took the car to a Corvette mechanic in Orlandoand paid them to take care of oil and transmission leaks. I returned the cartwice because it still leaked. I was later informed by the owner that all C3sleak and can’t be fixed. I was also told to “just keep the transmission fluidtopped off, which I am sure you know requires the car to be jacked up or on alift. The questions I gave are: is this true, all C3 manual transmissions leakand can’t be repaired? When I inquired about replacing the 4-speed with a5-speed I was told it would cost $8k and even a new transmission would stillleak. Is it really impossible to fix the leak? Thank you for any comments andsuggestions