The recommended transmission flush service that the dealer offers is $349. That 18 quarts of Motorcraft Mercon ATF, filter, and labor. (They're charging you $175 for the filter, that you can get online for $74) The oil is $7.49 a quart.

So my question is this. I have heard that some trucks experience major transmission problems resulting from the power flush. Is it really necessary to blast all of the fluid through the system? Why not just drain what comes out from dropping the pan?
The power flush blows everything through the coolers, both back and fourth, causing who knows what to the system.