Re: 14 SRT Springs on 14 Overland
All I know is that you CAN change springs on a 4x2. I don't know whether the SRT springs are a "direct replacement", however.
Current: 2015 Jeep Grand Cherokee Summit 4x4 -- Granite/Dark Sienna, 5.7L HEMI V8, Platinum Series Group, Skid Plate Group
Past: 2014 Jeep Grand Cherokee Overland 4x4 -- Granite/Beige, 5.7L HEMI V8, Quadra-Drive II, Advanced Technology Group