Looking for help/ solutions... Have an E78 with the above cal ID... I have a supercharger sitting here for it although no support for the PCM (well, very limited) I would like to change it to an 12647731 although I have tried with another truck at my shop... It works (with vats off) although I do not have a speedo and the ABS/ brake light is on. I believe this has to do with the truck I have in front of me having a manual transfer case and the file I am using has an auto select t-case. I do get a code for U0102- lost comm with tcase module (there is not one) I am guessing this is where my problem lies although I am not sure how to get around it-