Re greasing sealed hubs!? (Blazer upgrade)

[83beater]

Done with it hahaha..honestly I cant tell the difference if it helped or not! Haha.but at least I got some lube in there ;D ..I'm getting a screeching some when I'm stopping and when I release the breaks..hope they just setting

 

[83beater]

i have a some rather stupid questions to ask.
why do we need to add grease to a sealed bearing?
where did the grease go?
if i pack in too much grease, what will happen when it heats up and expands?
should i make a little dip stick for it, so i can check to see if its low?

Well played.lol I would "think" grease thins out with time and heat.
Where did it go? Is true .I notice my grease gun drip when it sits there with heat .turns into oil.but I got them from junk yard so knowing I put sum in there works for me .