Explorer has the 6R60 transmission 70K miles and I noticed for the first time that when I have the vehicle in "Drive" on a uphill and let off the brake pedal the vehicle holds its place. But if it is in "3", "2" or "1" it will roll backwards down the incline.

Is this normal?

Also I am looking into a filter change but can't find info on the 6R60 for fluid fill location and fluid check location.

Any help here?

Thanks,