Ok, I am a damsel in distress, need help bad.  My 1996 blazer won't auto
shift into 3rd gear.  Going down the freeway this morning, noticed the engine
started whining high and temp gage shot up, realized then I was stuck in 2nd
gear.  Reverse and everything else works fine.  Had to drive home 20 miles an
hour, and now am at a loss as what and where to begin.  Please help.  Does
the tranny need replacement?  Oh and it does have fluid, I checked that.
Thank you so much for any help or advice.