For the hard core Mopar people, either cut the long tube and shorten to the short side length. Then get a NEW short side axle. The reason for new is the axles can "get used" to torque applied in one direction. If you switch sides and apply higher torque, you could end up with a failed axle.
Another way is to hole saw the welds out that hold the tube in and press the tube out. Cut the axle length difference off the inner end before pressing it back in. Verify tube is straight and weld it back in. Go around the outside off the tube starting 90° apart, and verify straight. Weld one 90° and then directly across. Verify straight and weld the rest. Weld where you cut the original welds out. Weld the short side tube to the housing the same way.