This may be one of those situations where I can’t give enough info in a medium such as this but here goes…

Not every time but often this weekend when I’d let off the accelerator there would be an intermittent "grinding" noise. I might be making this up but i think I could feel it. Almost like whatever was making the noise was "dragging" on the car more than the normal engine braking. It seemed to happen more when going downhill than on flat ground.

Any thoughts about where to look first?

Thanks,