It's on the passenger side of the pan, towards the back.
2002 (2003 model year is half and half it seems) is the best year to get without running into problems.
Make sure the tailshaft has splines on it for the speedometer gear, and check the VSS sensor hole to make sure it's got 6 holes in it when you spin it all the way around. (you'll need a tune or a purple speedometer gear. If you change the gear, you're limited to 3.27s if you use a FRPP speedometer gears)
The splines NEED to be on the tailshaft or you'll have to swap yours. (Not recommended. It's the first thing in the transmission case, last piece out)
The second thing is the VSS needs to have 6 holes inside when you pull the sensor and spin the tailshaft. If it doesn't, it's not the end of the world, you'll just need a tune.
The last thing is repinning the transmission harness, which takes about 15 minutes even for a first timer. Look at schematic 1, compare it to schematic 2, make the changes necessary.
I just did this swap recently. But there are people with way more knowledge then me.