Yes they are sealed. They have to be pressed out with a 3 ton hydrlic press. The intire spindle needs to be removed from the truck to press the bearing off. The bearing is 60 bucks, one per spindle, it is basically two very large bearing in a double race. No way to even see it without pulling the front axle shafts, even then you will not see much.

All this needs to be changed out for the Manual Hub kit. Also the bearings get destroyed when pressing them out.