Rear end noise

When im driving along, and i clutch (cant hear it over my exaust) in i can hear this sound coming from the Rear right (if your facing forward) That is a loud ticking, Its only when its moving, if im moving fast enough it sounds like the ticking a sprinkle makes just faster.

I think it may be the diff, i just dont know its to dark to work on it right now and i need to fix it for tommorow.

It just started after my parking brake stopped working so is it possible that, that has somthing to do with it.