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Old 06-26-2012, 12:47 PM   #1
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Replacing Rear Shocks with Sportlines Springs.. What shocks can I use?

I have an Eibach Sportline (springs/shocks) kit on my 04 SVT, and the right rear shock is rattling really badly. It's gotten progressively worse over time, and now just rattles anytime I hit any bump. I'm not able to get the lower bolt out to remove the shock without a impact wrench, but I was able to take the top off the shock to replace the mount (thinking that was the problem).. The shaft of the shock is all chewed up where it appears to have been hitting the body of the car. I'm able to pull it down by hand, and the shock slowly returns.. I'm thinking this has gone bad, and want to swap out the rear shocks with something else.

So through my research on here, I'm thinking a set of Koni STR.T rear shocks would be the most cost effective choice.. I really only want to swap the rears out and keep it as inexpensive as possible.


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Old 06-26-2012, 06:07 PM   #2
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This is a very common question that has no simple answer. The Sportlines, in my opinion, are schizophrenic. The progressive rates seem to be too soft initially and then firm up too quickly. The amount of drop they afford requires a shorter shock/strut for travel reasons. The Strts are proving to be a good shock and capable of handling most 1.5" and less drops but a 2" drop may be asking too much. They are not that much shorter than stock so shock travel will be impacted by that amount of drop. The ideal shock for this spring is probably a Koni Sport which is very capable of handling shorter and stiffer springs very well. You can also use the shocks adjustment knob to fine tune the damping of the springs. Spax dampers may be another option as they are often used with 50MM drops (aprox. 2").
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Old 06-26-2012, 07:50 PM   #3
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Spax and other good shocks available here: http://208.109.215.220/files/focus.pdf
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Old 06-27-2012, 05:08 AM   #4
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Would the M-5560-ZX3B FRPP struts be good for this? Since it is part of the dynamic kit instead of the regular FRPP kit. If i remember correctly, the dynamic kit was also a 2" drop like the sportlines.
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Old 06-27-2012, 09:01 AM   #5
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Definitely the Koni Sport

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Old 06-27-2012, 11:29 AM   #6
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Quote:
Originally Posted by nowhere67 View Post
Would the M-5560-ZX3B FRPP struts be good for this? Since it is part of the dynamic kit instead of the regular FRPP kit. If i remember correctly, the dynamic kit was also a 2" drop like the sportlines.
I think you have some part numbers mixed up. The ones you mentioned are the standard FRPP shocks for 06+ cars and commonly used with the FRPP 1.5" drop springs. The Dynamic by Tokico shock for 06+ cars is part number M-18000-ZXM1. I'm not aware of any of the FRPP springs having more than a 1.5" drop.
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Old 06-27-2012, 02:24 PM   #7
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All right then, i retract my statement. Yes, I grabbed the wrong part number out of my list but i was meaning the dynamic kit. I know I've seen a few places online say it was a 2" drop and a few boards saying the drop was similar to the sportline and lower than the proline. But now that i look around more i see places say 1.5" drop. Guess i haven't researched them enough, and i was thinking of pairing those together myself when it came time to change out my suspension. Oh well, live and learn.
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Old 06-27-2012, 02:38 PM   #8
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I've got the STR.T shocks and struts all the way around and I've had them for about 100 miles with a 2" drop and have no complaints. I haven't heard anything bad about the STR.T's with a 2" drop before that previous post. They're offering a very stiff ride, which is what I wanted and for a good price, but if you can do the sports go for it.

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