what does the {D}stand for,? on 1994 Ford Explorer

transmission wouldn"t shift from 1 to 2 until it warmed up so i changed filter and it still does it,any answers would be appreceiated.

2 answers
The D on a automatic transmission is the highest gear or freeway gear, You should not have to use 1 or 2 gear unless your towing or 4 wheeling.Just leave it in D and it will shift automatically.
(D) Drive...