Jake, part of learning how to work on bikes is if it's works don't fix it. Freewheel or freehub, you will want to get a set of cone wrenches and remove the nuts and cones on one side of the axle; then remove the axle so you can get to the bearings and service them. The only difference between a freehub and freewheel is the bearings at the end of the freehub that supports the axle. What that means is it is a stronger setup, but maintenance is the same. After removing the axle and how it's mounted. If you look down the middle of the freehub body once the axle is removed (what you know as a freewheel is called a freehub body with a freehub) you will see, instead of splines at the top, there is a 10mm allen socket at the bottom. You will be able to remove the freehub body will with a 10mm allen wrench the same way your would unscrew a freewheel, accept rather that a freewheel being screwed onto a threaded hub, the freehub body is held on with a 10mm allen socket. Here is a good "how to" site http://www.parktool.com/blog/repair-...reehub-service