Hugh,
I looked over your posts lists and cannot find enough info.
A couple of questions; stock type front end on your 52? If you are talking shackles, I assume your truck still has front leaf springs? Regardless, shocks won't fix your problem. Sounds like someone took out too many springs, trying to put the truck in the dirt? If you are going to keep the leaf setup, you will need to get the springs re-worked. Are you running a stock 6 or? Again..not sure it matters, a stock 6 or a small block still require enough spring to support the weight. Adding a longer shackle just raises the truck...maybe. Sounds to me like the leaves are flattening out..If this is a Mustang II or Volare, the spring rate is not high enough to support the weight.
