I have a spare 2004 motor that I am in the process of tearing down. The previous owner pulled it at 115k miles suspecting headgaskets and let it sit for about a year replacing it with a cummins. I want to rebuild and freshen up a few parts/pieces. Question I have is that it was in a manual trans truck.....I have an automatic.....do the internals need to be rebalanced with a flex plate?