[6.2Blazer]

While not designed to be serviceable, you can buy a bearing greaser tool to grease them. They are the same "sealed" design that basically all quads and SxS's use, and they really aren't any different to get to than other brands. I will be honest and say I've never serviced mine with 2,000 miles on it, but probably should. I've had to replace several bearings on other machines that were obviously had (lot's of play).