The way I?ve read it is that the M47I (version 1) needed to be overfilled, but the M47II did not. Apparently we only got the version 2 in the US so you 'shouldn?t need to' but it won?t hurt anything at all. I just jack up the drivers side higher than the passenger, and fill until it comes out. Don?t need to measure anything.
They say that 5th gear starves for oil below a certain speed in 5th, like 45mph or something. No idea why anyone would use 5th below 60mph though. Unless you like lugging your engine and having no torque, then keep rpms around 2500-3000 all the time. That?s what I do. 3rd gear is the highest I use around town because it gives me passing power when needed and doesn?t lug the engine. Speeds are 45mph here max until you get to outer service roads or highways. I usually use 4th gear at about 50mph.
Besides, 3rd will take you from about 20mph to 100mph