What weight oil goes in transmission on a 1999 harley davidson road king with 88 cubic inch motor

Mostly all motorcycles use the same oil in their Engins and transmission, you do not needs to put a seperate oil into the transmission, as the engin and transmission uses the same oil, you will also see that there is nowhere that you can top up the transmission oil, most motorcycles use 20W50 oils, but it can also depend on what country you are from