Swap gears.
Then both of you have a chance to inspect the cases and gears before sealing the deal and you can check your seals and bearings.
I think that in order to change top shift to forward shift you need to cut rods and fab some stuff, I donīt think its a unbolt and bolt on affair. But Iīve never opened my case so I donīt know for sure.
Iīm sure Marlin or his gear techs would know for sure and can teach you many tricks to make the cases better too.
