The other issue to consider when anyone fits such solid mounts is that Ford designed the rear suspension of the Sierra based on the 3 legged stool principal, these mounts work directly with the rubber mounted diff hanger, and all 3 work in conjunction to provided NVH and an element of road movement/ compliance. When any of those 3 points are not consistent to the others then the suspension will not work correctly, this usually happens when the rubber degrades on one of those points more than the other 2.
If you are using such solid mounts you also need to solid mount the diff otherwise they are working against each other. I imagine a 3 point, solid mounted rear beam is not very comfortable on a road car.
Last edited by PAUL S; 03-04-2018 at 09:41 PM.