the biggest issue is that 3rd gens have the wheel bearings inside the whole front rotor assembly, you have to remove the spindle nut to take off the rotors. In 4th gens, they have a seperate wheel hub and rotor setup, where you can pull the rotors just by unbolting the wheel.
heres the link to hardcorez28s article...
http://www.gmhightechperformance.com...ade/index.html