why would the transmission work one day and not the next?

What is your question?

We were rocking the truck back and fourth due to been stuck in ice in the backyard but it seemed to have little power when hitting the gas pedal then today we couldnt get it out of park. Any idea as to why please? 2002 ford explorer

What makes this problem better or worse?

not much at all

How long has your 2002 Ford Explorer had this problem?

just started