Coil springs: Linear rate vs. progressive rate..? - Ranger-Forums - The Ultimate Ford Ranger Resource


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Old 04-18-2008
2002FX4's Avatar
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Coil springs: Linear rate vs. progressive rate..?

So as I am reasearching into what coil springs I will use when I do my leaf-to-coil swap, I've come upon these two types of springs.

An example of each:

Linear: http://broncograveyard.com/bronco/i-..._coils_5__.htm

Progressive: http://www.cageoffroad.com/product_d...d=34&itemid=65

I initially was liking the progressive rate coils as they seem to be similar to a coil-over setup, with the two different spring rates. But as I read on, it seems that perhaps a progressive rate coil isn't as good in comparison to a linear rate coil?

Anyone who can add info/insight would be great!
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Old 04-19-2008
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I am not sure about rates...

but they said 23.5" in length out of the truck. my 5.5" XJ coils were 22"

I have not noticed any sag yet.
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Old 04-19-2008
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I'm using 17" long (uncompressed), linear, 1979 F-150 4" lift springs. Seem pretty compliant and I've got adequate flex for this build of my truck. Nice ride.

I don't know enough about progressive rates to even comment. I'm not sure for instance what they would do for my setup when I'm happy with it already.
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Old 04-19-2008
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Thanks John..

And Zach, it would appear the RE TJ coils you're running are linear as well.

I'm going to ask around some local guys and see if I can get any kinda of decent answer.
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