Oh Yes, there is another way to get a complete change but it usually requires some extra fluid. Many of the dealerships and some tranny shops have pumps that they connect at the return line to the trans. They pump new fluid in which displaces the old fluid, pushes it into the pan thru the valve body, TQ, and cooler, back to another chamber in the pump. They don't even have to drop the pan. There have been technical bulletins out because of unscrupulous service people who don't bother to change the filters. In fact, some manufacturers, such as Toyota, have eliminated trans filters completely while others are going to the external spin-on filters so they don't need to drop the pan to service the fluid. Saves them time and labor, and the customer gets a more complete change of fluid at service time. They also get to charge more for the service because they are using new high tech equipment, and selling more quarts of fluid. Of course, if you use AMSOIL ATF you put one over on them because it will last for 100,000 miles or even longer. One Amsoil dealer just changed his in his Ford E350 van with 165,000 miles on the fluid and tranny. The Ford Dealer was so impressed by the fluid that they signed up to sell AMSOIL products.
