Car Stereos: Speakers in 2002 Silverado, factory holes, sterio

Question
Is it possible to replace all the speakers and add a sub woofer but keep the stock sterio in the dash of my 2002 regular cab silverado?

Answer
Oh yes, It is very easy to do it that way.  I would goto Crutchfield.com and they will tell you which speakers will fit in the factory holes.  Pick out your speakers and just hook them up, done.  The sub and amp is a little more work, but quite easy if you are prepared.  Hope this helps, Scott