Leaky axle shafts

Hi I have a 1966 dodge dart gt v8 4speed car. I have recently been going through everything. After doing the rear springs shocks and brakes I noticed an oil leak from one of the wheels. It looks like it is coming out of the axle shaft. It is a stock rear I think it is the 7 1/4" I know there is a seal in there, my question is with all of your experience, is this something I should take to a machine shop for? If so how much do you think it will run? Or is this something I can tackle with my rudimentary tools?

Thanks