Strange Noise, Driveshaft?

My guess is a dry u-joint.
Maybe a leafspring, it's perch, or a bushing.
Unless the driveshaft is getting into the park-brake cable, but that's more like a ting-ting-ting.

But if it involves the brakes, then adjust the rear brakes up tighter. If it persists then remove the drums and go have a look at the backing plates.

That's all I got