This past weekend I installed my Sportline kit on my 85 IROC. I love it! I would recommend the kit to anyone looking to lower their car. The car has a real good stance to it now and seems to handle way better! It's a good kit. The swap only took my 35 minutes to get all 4 in and out. Didn't even have take the calipers off the front of the car here's a photo after the spring swap.

Why is the new fender height? What tires do you have? Does anyone know the technical rating on these, all I have ever seen is that they provide a 1.5" drop.

I agree I-rocz/28 I have had the pro kit and sportlines and the sportlines are all around better springs even though the pro kit has the better numbers I just don't see it or feel it.

The new height over the tire on the front is maybe inch at most. I can barely fit my hand I between the fender and tire now. And the back is maybe 1.5 above the tire. My tires are 245-45R17 The springs dropped the car A LOT more than I was expecting but I'm extremely happy with it.

Ok, so according to tirerack.com the overall diameter of that tire is 25.7." I know it would be less once on a rim installed on the vehicle but its close. Fender height of 26.7" front and ~27" rear. But again, does anybody know the lbs/inch rate of the Eibach springs?

Not a clue.. Have you checked their website any? Might have that information there. It's worth a try. If I had to guess they might be close to what factory spring rates are but with shorter springs..

How great, I never noticed that thread. So it seems that the Eibachs are very comparable to the Moog#5664 or #5662, maybe even the #5660! Only advantage seems to be the lowered ride height.