A few things to check for knocking noises
Front engine bay braces
Rear diff mounting bolts front one is hard to get to 22mm socket, a couple of extension bars and maybe a UJ.
Rear UJ joint that goes onto the diff input flange needs some grease inside the flange on the prop shaft side.
All the other suspension bushes and bolts as well as the two diagonal braces from the diff to the rear wheel arch area