1997 Plymouth Voyager transmission clicking

it's possibly coming from the oil pan and not the transmission. It's a loud clicking and I can not find anything to tell me what it is. It's kinda like sticking a playing card in the spokes of a bicycle.

Can't really hear the noise from here. Does it do it all the time the engine is running? Just for one second when you shift into drive or come to a stop? Why did you need to add fluid? Do you have the three or four-speed transmission? With the four-speed there will be a circle around the "D" on the shift indicator on the dash, unless you have small lights that show which gear is selected.