rear bearing adjustment

Putting tires on my 67 Barracuda and I noticed up and down play on the passenger axle. The bearing feels fine and of course I can't do a visual without removing it, so I put new seals in and tried adjusting. In order to adjust any up and down slop out I don't get any end play. Is this a telling me I need to replace the bearings?

What axle 8-3/4? How did you replace the seals without pulling the axles? And outer seal without pulling the bearing?

When I have to do an 8-3/4 I pack the bearings with grease after replacement or even just removal prior to insertion and then set the end play to near zero.