Knocking at rear tire...

There is a knocking noise around the rear passenger side tire of 95 Wrangler. At speeds in excess of 35-40 mph is when the sound appears. The faster I go the faster the knocking is. It's driving me bonkers and I'd like to try fixing it myself, if possible. No other mechanical problems are present. Help!, please? Any ideas as to the source of my problem will be much appreciated.:runaround:

sounds like a sticking brake shoe or drum that seriously out of round