Knocking noise from pass. rear

[MitchFong]

knocking/ticking noise has been getting on my nerves lately. It usually starts when im going about 65ish in third, and it gets faster/slower with speed of car. I put the car on jack stands and spun the wheels but i couldnt hear anything. So, i go under further and see a few lines going around my drive shaft just in front of the diff. But i felt above it and could not feel anything touching it. So im wondering if it has to do with my diff? I checked the fluid level and that looked good/right level. Also checked cv joints/boots and they were good. Wondering if anyone else has experienced this?
Thanks,
Mitch

[mazur]

I just started getting a similar noise. It only seems to become apparent after a quick turn or just after spirited driving. Noise stops when I apply my brakes.

Checked everything out under there and found nothing that is loose or bad. Hoping someone has some suggestions.