...............Ok , drove by trany shop and had them pull dipstick on trany , tech said fluid looks ...Like it had very few miles even though it has 27,xxx miles on the clock ! He also said they are recommending that the newer Rangers with Mercon 5 Wait too flush and replace filter till 50,000 miles ! Specifically , this applies too trucks NOT pulling trailers , and used mainly for highway commuting , which my truck is . Now , money is very tight so My plan is , after I review the comments on this thread I plan on buying 4 qts. of Mercon 5 each month and changing the fluid next spring which means I'll probably have around 35,000 miles on the truck . And , I plan on using the paw paw method too save some $$ . , thanks , rb