8-3/4 axle seals?

I would look at the bearings on both axles first. If they are good, do what ever you were going to do with the seals.
As far as the adj. goes-- there is a locking finger on that adjuster, remove it and turn the adj. ring clockwise to tighten up your end play. Someone help me here if I am going in the wrong direction, it's been awhile, my car has the conversion. Anyway, adj. until you have just a little end play, it's a feel thing.