If you are referring to the pin in the front of the shaft, it is a (solid) steel dowel type pin, a spiral pin will only last a few minutes in there and a roll pin won't last very long either.
If the hole is enlarged I have taken the shaft out and smacked the hole with a hammer on one side and then drove a new pin in from the other side. It's still in there (I guess, it still drives).
If you are talking about the pin in the rear flange on the transmission input shaft, then my best guess would be a heavy duty spiral pin.
I've never seen an aluminum coupler.
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