Hiya ..
When do you get this knocking? Over light bumps? .. or hard rough stuff?
I think you should jack it up and take a good look at the subframe mounting bushes .. and the trailing arm bushes for perishing/wear. Early Pumas have a fork rear mounting, I thing .. later a rod eye. Have a look around there.
Also the rear shock mounts. It's also known that the dampers themselves can make odd knocking noises from the piston shaft .. there is no alternative to take them off to check, really.



