94 ford explorer wont shift into overdrive.

94 explorer wont shift into overdrive, and when
i put it in gear i have to wait 5 seconds before
i can go any were whats wrong?

The first thing I'd check would be the fluid. If it's "full", or nearly full take it somewhere and have it flushed. (This is NOT just draining out the old and pouring in the new) When I had mine done it cost about $65 and was worth every penny!

ive had it flushed new, filter. i sold it for 1400
today any way, it was falling apart anyhow.
GLAD THE PEICE OF JUNK IS GONE.