[Tomq]

To answer your questions, the springs do have some arch to them ,when no weight is applied. Then the springs go almost flat,and the shackle is tight against the "safety block". There is a lot of room to the rubber bump on the frame from the axle and spring mount. The shackle has a tendency to move towards the rear when bounced by hand in the shop. I have not tried to drive anywhere until I fix this problem,Tomq