A few weeks ago when I found myself dropping the Power switch off (ya ya, so I drive more light hearted now), my clunk has REALLY decreased. By easing the shifting ranges to a more nominal setting, up and down shifting is nearly clunk-free now. Ya, I still get one occosionally, but for what it's worth, if you don't like the clunk and don't drive spirited (Power ON is hell on heavy wheels with a S/C to get the best out of it), Power OFF may very well help.