Dt466 "b"?

[SkoolSurfnSnow]

Has anyone ever heard of a DT466B? I called my international guy and he says there is not such thing as a B model. I know dt466E is a thing, but i've never heard of one with the B.

Also, anyone know what year they began making the allison at545?

 

[Tango-SKO]

I believe the entire AT line was introduced in 1970.