Gabgb

Hi, i have a 2000 chevrolet silverado extended cab 6.5 box 4x4, the frame is crack badly. But it only have around 150000km (engine, trans, body... in good shape) I would like to know wich frame i could take to do a complete frame swap. I guess it will have to be from a silverado or sierra from 1999 to 2007 ext cab 6.5 box, but can i take a 2x4 frame or its not the same as the 4x4? Thanks