I recently redid the axle shaft seals in my old '79 F-150. However, the axle shafts themselves were quite old and worn out, so the seals did not last very long. I'm looking to buy new axle shafts so I can stick them in, but I have no idea what type of axle I actually have. Where or what do I look at to determine what shafts I need?

Thanks!

-Kamil