Looking to see if any dealer tech or parts guy or someone who's looked into it will know. I have an 2011 ext cab GMC SLE 4X4, I've used a preload lift on my last truck. Adjustable Bilstein 5100's to get 2" of lift. Strut tower pucks are all so okay but what I'm looking to find out is. Dose the GMC "Off road" edition use a taller spring in the coil over spring package? On the lot it looked like it had a little more lift or level appearance, up front than my truck. I'd like to use a taller spring up front, especially if it could be a direct GM part swap with a good progressive rate spring. I'm going to keep searching for a part number list with definitive answer, any help would be much appreciated. A positive 2+ inches is what I'm interested in. I know there are many options out there for leveling, this is one I'd like to do if the GM spring is taller on the "Off road" edition.