I can swap them side for side but I can't flip them over too.  There is a spacer on the gears that faces the front of the tractor.  If i flip them upside down, that spacer is then facing the back and will space them away from the springs and won't allow them to engage with the springs.  

I think i'll have to wait to find a picture.

I don't really know anyone who has an oliver around here.  I'm in good with the IH crowd but this is my first venture outside the red tractors.

Hopefully someone will post a pic.

thanks for your help though!