I replaced with aftermarket ones, use good quality wheel bearings. Ride feels OK. Drive shafts are easy to replace - undo main hub nut (crack the nut with wheel still on the floor as it's very tight). Undo the six allen bolts on inboard side of drive shaft (drivers side is a split shaft with a bearing carrier bolted to the engine (I replace all of this). Undo steering arm and swivel enough to remove drive shaft out of hub. Replace in reverse order.