As far as I know there are no upgrades other than a solid axle swap with a dana 60. Alot of people have good luck with Timkens. As far as hubs go I have never found better quality than stock. I usually get junkyard hubs for my jeeps for $20 at a u pull it. Low mileage and no mud is what counts. Hubs don't go bad on stock vehicles that stay on the pavement. My father had 380k on his stock hubs on his grand cherokee, it was never taken off the pavement. I consider low mileage junkyard hubs better than 98% of your aftermarket hubs. As I stated in another post though, some people just can't stomach the fact of junkyard hubs and must buy new, under that case Timkens or dealership are going to be your best bet.