I measured the gaps between the coils (free length) of the Eibach 550 lb. spring compared to OEM and found the Eibach coils have larger spaces. Based on that I did not expect any coil binding to occur. The spring wire was the same diameter as OEM (at least as far as I could resolve with my admittedly cheap harbor freight caliper), but with about one less turn on the coil. That, and perhaps the spring material, would account for the ~30% increase in rate. I find these coil binding predictions somewhat surprising and wonder if the OEM spring has the same limitation?
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interested in this collar. I didn't use one but I wrapped the shock body in rubber to hopefully stop the spring rubbing on the body. Over the miles (+50,000) though the spring has never moved.I just got off the phone and ordered the 500 lb Eibach spring and top collar/bushing to bring down the diameter from 64mm to 61mm so it isn't so loose.