Hey guys. Been doing a small amount of research but not a lot. I was wondering if the 8hp90 is a direct swap form the 8hp70? Lots of guys are taking about kits and stuff for older rams but I searched the forum and didn't see anything relevant to a straight swap on these. I also need to look and see if they make a 4x4 version of this trans. But curiosity has Me wondering. I'm assuming it is because from what I read tcm is within the transmission and signal seems to come from pcm for temps and input signals. What you all think?