Im transfering my 370 into my truck which is a 00 silverado with a 4l60e. How do i upgrade to a 02 OS? Also im thinking i have to change the tune from a 5.3 to a 6.0 with a 4l60e. But how do i go about doing this? All the tunes i have found at holden have the 6.0 with a 4l80e. Then do i have to change B0104 cylinder volume? I need some help guys im a noobie at this. I have done alot of searching with no sucess. Thank you in advance.