95 Max - Car shifts Park, Reverse, Neutral, Drive OK.
When in Drive the car starts in 3rd and stays in 3rd at all speeds. OD switch light goes on and off, but no effect on tranny. Shifting to 2nd and Low have no effect on tranny.

Just had tranny flushed and drove OK for three days after flush. Big snow storm yesterday and drove car without OD. Today I have only 3rd gear.

What could it be??

 

Sounds like the tranny is in fail safe mode. If it doesn't reset itself, try disconnecting the battery for an hour and drive it again. It should reset itself.

 

man your 0-60 times must be high teens!

 

I have had this happen to my 99 SE-L a few times. All the times it happend, it corrected itself.