All I can say is wow.I had the fluid changed and the truck runs totally different,the shift points are better and no more clunking.Had to fight tooth and nail with my dealership to cover the cost,but they did.But don't get me wrong my truck didn't shutter at all,and would clunk once in a while.The service manager was useless,but the shop foreman was very helpful.Guss who came to my rescue to have it covered.A secretary from the back office,she says this is why I keep this work order in my desk,it states that changing the fluid is covered under the power train warranty.My service advisor didn't even know this.