Okay guys just an update. John Calvert just got back to work after a cross country race trip & looked at the video of my car. Now he says its not spinning but hooking so good that my 60' times are slower, yet et is off two 10's. Does this make since to anyone? If it was hooking better why is it slower ? I did rethink the insatllation , and it dawned on me that when I put the springs in ,the center bolt would not line up with the spring perch on one side.(I could'nt even pry it in place) So I removed it from the rear shackle,loosely attached the spring with the u bolts to the diff., then tried to reattach but then the end of the spring was over 2 inches inboard of the rear shackle & I had to pry it in place while my brother attached the shackle! Also now my rear shackles are strait up & down versus being angled foward @ top like they should be. When I metioned this to Calvert he said that it should'nt affect 60' times, & came up with the above about hooking so good that the 60's are worse. I'm no rocket scientist, but with that much pressure on the spring sideways surely its got to be causing a problem! What do you guys think? All I hear is everything needs to be loose,so isn't this a contridiction?