I sold Vanbox a complete 06 LBZ and trans out of a dually. The harnesses, computers, accessories, pretty much everything but the dash and transfer case. He just sent me a text this morning and it runs great but only goes in reverse. He is in Australia and I am in Texas so its knida hard to help out much. He is a member here so I will direct him to this thread so maybe we can help. He has tried a different TCM and EFILive shows no codes. Any ideas? The truck slid into a ditch on its side, no roll over or anything, they pulled it out and drove it home. Insurance totalled it which is how we got the parts.