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Driveline
Broken halfshaft
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<blockquote data-quote="ac427cobra" data-source="post: 9888911" data-attributes="member: 6247"><p>I saw <strong>NO</strong> spring rates on your link except for coil-over spring rates. </p><p></p><p>The H&R race spring rate for IRS 770# found here:</p><p></p><p><a href="http://www.americanmuscle.com/h-r-race-springs-cobra.html" target="_blank">H&R Race Springs (99-04 Cobra) at AmericanMuscle.com - Free Shipping!</a></p><p></p><p></p><p>This link shows a different spring rate the the H&R race:</p><p></p><p><a href="http://www.svtperformance.com/forums/fox-body-cobras-23/630346-stock-spring-rates.html" target="_blank">http://www.svtperformance.com/forums/fox-body-cobras-23/630346-stock-spring-rates.html</a></p><p></p><p>Shows OEM 2004 Cobra IRS springs @ 600#. This is the rate your OEM shocks are calibrated to operate. </p><p></p><p>The H&R Race spring shows a rate of 850#. This is a OVER a 40% increase in spring rate. You can't expect an OEM shock to properly dampen a spring with over a 40% rate increase.</p><p></p><p>So I'm not really sure what the spring rate is because of the conflicting information. But........... I can tell you for sure it's a substantial increase and the stock shock is not going to cut the proverbial mustard with a higher rate spring. </p><p></p><p>I do not deal at all with stock location springs because all of my track cars are on coil overs. But when I change springs on my coil overs I either have to adjust the dampening and rebound or have the shocks revalved. </p><p></p><p>That's all! </p><p></p><p>:thumbsup::coolman::beer:</p></blockquote><p></p>
[QUOTE="ac427cobra, post: 9888911, member: 6247"] I saw [B]NO[/B] spring rates on your link except for coil-over spring rates. The H&R race spring rate for IRS 770# found here: [url=http://www.americanmuscle.com/h-r-race-springs-cobra.html]H&R Race Springs (99-04 Cobra) at AmericanMuscle.com - Free Shipping![/url] This link shows a different spring rate the the H&R race: [url]http://www.svtperformance.com/forums/fox-body-cobras-23/630346-stock-spring-rates.html[/url] Shows OEM 2004 Cobra IRS springs @ 600#. This is the rate your OEM shocks are calibrated to operate. The H&R Race spring shows a rate of 850#. This is a OVER a 40% increase in spring rate. You can't expect an OEM shock to properly dampen a spring with over a 40% rate increase. So I'm not really sure what the spring rate is because of the conflicting information. But........... I can tell you for sure it's a substantial increase and the stock shock is not going to cut the proverbial mustard with a higher rate spring. I do not deal at all with stock location springs because all of my track cars are on coil overs. But when I change springs on my coil overs I either have to adjust the dampening and rebound or have the shocks revalved. That's all! :thumbsup::coolman::beer: [/QUOTE]
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