I have a 1998 580l the transmission suddenly stopped working this week. A little back history it did this about 6 months ago as well. The first time it i disengage the 4x4 and it was just dead right there. I switched the 4x4 a couple times and changed gears and shuttled between forward and reverse and it has worked every since. Well this week it did the same thing except when the 4x4 was engauged. Now it sits and don't move at all. I was leaning towards an electrical problem so I called the shop and had them send a truck out. They say the electrical side is fine and it is most likely the charge pump. Has anyone here ever changed a charge pump out? I'm not really wanting to spend that much money as the estimate I got. Any idea how the easiest way to change one is? Is that the most logical place to start? Anything else I should also change in the process?