4-Speed 904 For \6?

TrailBeast said
I'm not positive on this, but I think they quit using the slant 6 before the overdrive (A500) was used.
But the overdrive unit could be put on the slant 6 transmission as far as I know.

Do you mean an overdrive from a late model 904 could be mated to the early \6 904?

I wonder how you would go about controling it?