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Yes I have heard of it, my brother had one. My book says they were offered from 72-76 and has THM375 cast into the bottom of the extension housing. My book also says they made a THM475??? used in 71 up med. duty trucks, buses and motor homes and a dead ringer for a 400, the only way to ID it is the tag. This is the one with the straight cut planetary gears. Learn something new every day. I have the book THM 400 transmission book by Ron Sessions, it's got a ton of info on identifiying them.
Mike
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