Core supports are the same.
Its the way the radiators mount that is different. The 00 and ups radiator mounts to the front of the support. The 99s mount below/behind. Not to mention the 99 and down radiator overflow tanks will not work with a 2000 and up radiator. So if you change that tank to an aftermarket one. You should be fine. You would also need a new radiator hose as the newerones have the cap in the middle of the hose.
jmaack727, i got the parts and it looks to me that they bolt to the rad itself if not i can make it work, but does anyone know if ill have trouble with the trans cooler lines threading or being the right length?
and how many of you guys are usin a aux. cooler, what type/ brand, and how hard was it to install?