The transmission fluid in the Buick is a light brown color, not red at all, but not dark brown or black either. I plan on having the pan dropped and having the filter changed. I know this will not change all of the fluid but will it be enough to "help" the transmission shift any smoother, or last any longer? As of now it shifts fine when cold, but when it warms up the shifts become firmer and clunkier. Not whiplash hard, just clunkier and firmer. Should a pan drop help shifting right away? Or should I wait and just have the whole thing flushed?