I bought some new 6" rear springs from Skyjacker "dr60s"to replace the rear 6"lift blocks. I also built some rear shackle flip brackets to geat rid of the factory block. I used the plans in the parts section of this site. My problem is the new springs are 4" too short. The shackle hangs in tension ei"the shackle is parelell with the spring. Do I need longer shakles. should I reposition the shackle mount. I realize the springs are shorter due to the enhanced arch.