I have heard(heard, not seen) of an OD mechanical allison transmission that was in coach use back in the 60-70's behind 2 stroke detroits.
Looking back through my bookmarks, it looks like the # is HT70.
Once again, this is an old transmission so finding someone who knows anything about them might be hard, let alone finding a transmission itself.
Only other thing I have to say about it is that it was a heavy duty transmission, and will likely have an sae 1 or larger flywheel housing, and won't easily work with most school buses.
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