your coolant is dex coolant, its brown and crappy. flush it clean, then re fill using the green coolant.
you cant clean a cat.
those bearings are a waste of money, buy a name brand parts local from a parts store with a 3 year warranty, your gonna need it. ive warrantied the same hub 3 times now, with no real miles to speak of.
this way when it goes bad it a local trip to get a new one. no shipping or BS involved. you can buy them at advance auto's web site, add a discount code and pay less, then pick up at your local store.