Here's a quick and cheap way to change your car's transmission fluid without the hassle/mess of dropping the pan. I know I'm not getting all the fluid out but swapping out 4 quarts of the old, dark fluid out for some fresh, and bright red fluid is definitely good for your 4R70W. You could repeat the process a couple times to get most of the old fluid out. If you want to change the filter then dropping the pan is required.
