I had the Ouverson spool in my old 14 bolt, the fit and machine work was pure quality. I really don't think you could break it or a 14 bolt "lincoln locker". That axle is pure beef unless you have a big block and those heavy 53" military tires.
Welded 30 and 44 axles - no; 14 bolt - all day long it'll go strong, just burn it in with a good welder and slow cool.