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Is this T10 a mutant, with the alum tail and the steel case?
Trans-man says T10 two inches longer at the case; ear to tail case end. The gears are out of the M21; could the length variable be the size of the rear spline ?
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I just measured a Muncie and a Super T10. There is a 1/2" difference in length from mounting flange to the rear seal. Your Super T10 is not a bastard. A lot of those transmissions came with iron case and aluminum tail shafts. I have owned bout 30 of them over the years.
-Matt