8 3/4 axle removal question

You're going to replace the inner seals, and leave the bearings and outer seals? You'll have to check the end play. Don't over-grease the bearings, it can push past the outer seal behind the bearing and ruin your brake shoes.
speaking of, I would be remiss if I didn't caution you about using the correct wheel bearing grease. I've found that moly EP(charcoal grey colored) chassis grease does not work well on roller bearings. It's fine for ball joints, tie rod ends, and things with sliding friction, but it does not work that well for tapered roller, and ball bearings.