I posted a summery of my problem a few days ago but didn't get any useful answers. My 2000 Ford Explorer 5.0 V8 2WD is having transmission problems. Its stuck in limp mode, won't engae in reverse or neutral, and it threw these 3 codes; P1747, P1636, and P0750. However, I just noticed that there seems to be a piece missing from the bottom of my transmission. It looks as like there should be some kind of cap covering this hole but is missing and allows me to see the internals of the transmission. And judging by oil soaked components surrounding the area, I'm pretty sure it dumped all the fluid that was in the transmission. Pic below.