When I use the hose in a bucket method to do a fluid exchange, I add the new fluid through the dipstick tube. I try to do at at about the same rate as it is getting pumped out. The exception is when I'm doing a fluid exchange on a trans that doesn't have a dipstick tube, such as the 5 speed in the Explorer. Then I must use the two bucket method to suck fluid into the trans as the other is pumping out. That gets to be a bit tricky.
