I have a 2014 STX that I installed a 2/4 McGuaghy's with the slam air kit too. My question what are you guys doing to get rid of the vibration/shutter? I have installed 2.5 degree shims ( fat side facing rear ) and the vibration is still ther. I'm starting to loose my mind on this. With the shims installed the rear diff is still turned slightly upwards. I've been doing a lot of research on this, and ther is no one thing fix all. I've also been told to do 4 degree shims but I have questions on that too, cause the bolts that go through the leaf springs aren't long enough for the slam air bracket, 4 degree shim and the axel cup for flip kit right? So what then? Do they have longer bolts? What are you guys doing? If you guys have pics can you please post so I can see where rear diff position is. Please help. I see a lot lowered 09-14 trucks on here surely someone can help me out or walk me through this. I would greatly appreciate help on this.

 

Can anyone just snap a few pics of the rear diff at ride hight with zero vibration issues please.

 

Did you cut the carrier bearing bracket off and raise the bearing? From what I have found that is what "cures" the vibration.

 

Did you relocate the carrier bearing? I also have a 2/4 with 0 vibration/shutter, my kit called for the carrier bearing to be relocated and no shims were required. See below: