Those go in the front not the rear... The coils that have the coils closer together go in the front and the coils that are more even go in the rear. At least thats how mine is setup on my 4.5" iro and i sit at 5" all around
FYI, I had that same issue with my IRO rear springs. I was told by someone there that they send progressive rate stock V8 coils for the new rear 3.5" coils. I have a set of low mileage V8 front coils in my garage waiting to go on. My lift was originally pretty raked as well. I threw a 3/4" spacer up front rather than messing with the rear springs. I still have a slight rake, but it's nothing bad now. Based on what I've read and experience from others I know, the V8 front coils should hopefully put me to exactly where I want to be. Also, you'll love the IRO trackbar. The installation is definitely fun. I mean that somewhat sarcastically. The trackbar itself is a great piece of hardware. There's no way that thing is breaking, ever. Moving the ZJ side to side to get it wiggled into place is the fun part. For a starting point for the length, I compared the front trackbar measurements from the 3.5" lift to the 4.5" lift. I then took the 4.5" lift rear trackbar measurements from the instructions and subtracted the difference from the two front trackbar measurements to get my starting point. It worked out rather well. I'll have to shorten it some, I'm assuming, when I swap the rear springs.
Yeah. The front was easy in that respect. Not only was the rear difficult because of that, but I had a hell of a time getting the trackbar into either the body side mount or axle mount. I can't remember which, but it took forever. It was also the last piece I installed on the ZJ when doing the lift that took me all of 11 hours. I was pretty physically exhausted.
When installing the rear, i tried pushing on one side while a friend tried to get the bolt through the sleeve on the axle-side. Wasnt happening. Tried to figure out a ratched strap solution, no good. So i drove it a few feet where it sloped a little and it was lined up perfectly to slip the bolt in
Got lucky doing that. I was underneath pushing with my feet on the body to move it to where I thiught it needed to be. I'm not lookin forward to possibly having to adjust it after I put in my new rear springs.