I just got off the phone with eibach "tech support" and was told that they aren't allowed to give out their spring rates. Anybody know what they are for the pro kit or the sport lines?

For pro-kit

http://www.thirdgen.org/techbb2/show...hreadid=171129

I've seen on the net for pro-kit other ratings of 725 lb/in, but I think the posted numbers are accurate, give or take. The rears need to be stiffer. If you find stiffer rear springs with the same height, let me know.

Yeap, I read that post during one of my searches. I also came up with this. As you can see the 2 are conflicting. I also wanna know how he got those #'s since I just got off the phone with the guy who told me I wasn't allowed to know them.

http://www.thirdgen.org/techbb2/show...t=eibach+rates

I see what you're saying. The fronts are about 700, from feel, so I believe those are fine. I'd give or take about 25 either way on the front. The rears are too soft, from feel I doubt the 80lb/in #. In my car, it definitely feels like it's just a bit over 100, maybe around 110-120lb/in. or so...again just from feel. From that, I tend to believe the first link. The people seem to get the info from e-mail and not phone but when I e-mailed them years ago I got the "we don't give out numbers" line.

Edit: The 80# number in the link 25thrss posted is for the sportline. Pro-kit is stiffer in the rear.

On their site I couldn't find an email. Only a phone number. I wonder why they can't give out that info anyways, seems pretty stupid to me.

February Chevy High Performance says the Edelbrock front springs (Eibach sportline's) are 700lbs/inch

I just got the spring rates 2 weeks ago from Eibach for the drag launch kit.I emailed them and asked for the rates and someone called me back the next day with the info.If you want the rates for the drag launch kit its FRONT both sides 337-514lbs. REAR D-SIDE 80lbs. REAR P-SIDE 80-217lbs.