GC1 is giving up a U-joint, I think.
I sincerely hope it isn't something inside the rear-end.
Axle bearing wouldn't be too bad, but U-joints are easier.
It kinda clucks at low speed off-throttle, sorta like a front wheel drive when an axle bearing goes bad, but it sounds like it's coming from driver's side rear. Definitely the rear but the driver's-side-sound may be because that's the side I hang my head out while driving down the road. No tell-tale clanking going into gear, or on-and-off the gas.
