1975 A833 od, any useful parts for non od boxes

Oh no,The 20tooth o/d gear is much stronger, and I prefer it. But it seems to be somewhat rare.
The output shafts between the od and the std are completely different and there is no possible way to make one fit the other. Well you could adapt the od m/s into the std box by manufacturing a bushing at the 3rd gear position and using the od hub; but I don't think that hub would last very long. It was never designed to accept any kind of torque.
And yes, I have seen two flavors of od mainshafts; the 904 size, and the 727 size and even a GM size. There was also a 10spl input for chebby trucks, in a case with a chebby front end,IIRC. I think the application was for a chebby pick-up of late 70s early 80s, and a big 6banger;250 I think.I had opportunity to buy a half dozen of those a few years ago but the only useful parts for me were the syncronizer assemblies and the o/d gears themselves. And I felt the firm asking price was too high. Turns out it was a good decision, as I very quickly got away from od boxes.
Don't worry about the 18 toother; just be nice to it,going in.