I'm not talking swapping the housing, i'm just talking about the axles themselves. Is the O/D of the outboard axle bearing the same between he 31 and 33 spline axles and are the axles the same length? I'm sure the I/D is different, but if the O/D is the same there'd be no cutting or welding of any perches, just swapping two shafts and the putting the 31 spline locker in.