Or buy two used axles with backing plates. People are usually giving them away on here when they go to the IFS axle.

Pull you axles out, check them for play (axle pointing a the ground and the pressure plate on top, rock the plate. Shouldn't be more than like 1/2" of play) and replace your seals. Should take about half an hour. jack up and do one side at a time so you don't loose any gear oil.