Now that we know that Michigan and the Detroit area is one of the states that Transformers 4 production will be filming the question now is what locations. According to MLive.com one of them might be the General Motors Tool Center in Grand Blanc Township. The plant is going to be shut down in July so after that it would give Bay the freedom to what he wants without daily operations getting in the way. TF4 crew scouted the locations but no contracts have been signed so this just one of probably many places that Bay and company are looking at. Thanks to Sam N. for the link.