[Lynn Eades]

One way to try to remove the seal is with a slide hammer. Panel beaters used a slide hammer with a self tapping screw welded to a nut on the slide hammer. Carefully drill a hole into the steel body of the seal. Wind the screw into the seal, hook up the slide hammer, and try it.
The old war time seals are steel bodied with leather and quite deep, and will be hard to get out. You might have to have 2 or 3 goes at it, but each time the screw pulls out of the hole it tends to reduce the dia. of the seal body. A neoprene seal will come out easier.
Oh, by the way, oil weeping from seals with an occasional drip was quite acceptable when your jeep was built. Have your self an ali drip tray or two made up to sit under her.