Well, the engine design is from the 70s or earlier IIRC... or grew out of something from back then. So it was all SAE. Same with some of the other parts... rather than change things over that were running just fine they kept em that way, and used metric for everything new.
I would have been happy if they just didn't use the E12s on the top of the bellhousing, or alternatively, if some bastard hadn't stolen what was apparently $800 worth of tools out of the back of my MJ a while ago. I still haven't figured out everything that got taken, one of the things I forgot to buy a new one of was my external torx set, so there are two bolts still holding my broken transmission in, instead of the new one being most of the way in already.
I hate thieves.