I have a 1950 DeSoto DeLuxe Club Coupe (S-14-1) with fluid drive and the semi automatic gear box (low and high gearing with a clutchless overdrive engagement). I have some questions about the (correct) workings and maintenance. First of: When I lift off the accelerator it grinds into the overdrive. It sounds like someone wrongly shifting a manual box. This sound take about a second, sometimes longer, then it's in overdrive and can step on the gas. Sometimes though, it will not shift all the way trough and just grinds when I step on the gas. I then have to clutch or else I am powerless. My guess is that isn't normal and should be adjusted. Can I adjust this somehow? Next question: When driving in low (3rd of 4th) and stepping on it, it has a lot of slippage in the beginning. Could this be the fluid drive coupling or is the clutch almost dead? How much slippage must it have? Last questions about the Fluid drive: How can I maintain the system? Should I be filling the Fluid Drive somehow? Or how can I check the right amount? Cannot find this in the manual I have (see next question). Overall question about maintenance: I have a '49 Chrysler workshop manual (with C45 through C50). Can I use this for my '50 DeSoto or are there some significant changes between '49 and '50 and between Chrysler and DeSoto?