I read through the GMT900 post and it was never stated how the 4x4 swap went. I know the 4l80 has a 32 spline output and the nnbs has a new style mp1222 transfer case with 27 spline input. Do I get a do I get a transmission that already has the transfer case attached and the computer can be programed for the older case or do I need to get a new input shaft / output shaft to match? My 60e is toast and trying to find out what I need. T case is manual shift on the floor.