LMM Swap Help

looking for help with an swap, LMM 4l85 from 2007.5 Express van into 2006 Escalade. I got the engine in and wired to the factory fuse box in the Escalade and starts great off key, shows gear selection, drives but almost like it is in limp mode. Doesn't shift and in my Tech2 doesn't show speed but I can command the shifts. I am at a loss as to what direction to take as I have been over every wire multiple times in the last week. I really need to get this figured out as it will be my daily driver and hope someone here can help please.