If any of the photos includes the tranny serial number (in Blue Bird at least, it's included on the data plate with engine and axle information), or if you can get the seller to get that number off the tranny itself, you can look up that number on Allison's web site and find out what kind it is. It's not a bad idea to verify -- some sellers may be prone to guessing or assuming, but won't tell you that they didn't actually verify.
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