76 K10 hubs shaky top to bottom

[MJN]

Sounds like all balljoints and tie rod ends are due to be replaced, the more play the more vibration and wear on bearings and other components. Bearings are easy to replace if needed. Spindles don't go bad unless you spin a bearing or there is some other damage to them. If the hub seal surface is rough you can get a repair sleeve/speedi sleeve and corresponding seal for it. The spindle bearing, small needle bearing inside the spindle, along with the lip seals should all be replaced at this time as well (SBK-1 kit)- they're cheap and you did all the work to tear it down this far anyway.