For you guys with 2" lowering shackles that had to use shims: I had Belltech 2" lowering shackles installed on my 2014 RCSB, with no other mods. Now I have a vibration in the 20-30 mph range, that wasn't there before. I'm planning to shim it now, but my question is should the shim be installed directly between the bottom spring and the block, or between the block and the mounting perch that the block sits on? I've read through the thread, but it's not entirely clear to me.
Thanks in advance.