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progressive rate springs are usually a load of B.S. In the end after the weight is on the springs, the softer part of the spring will be fully compressed leaving the rest of the spring actually doing the work--- making it a linear rate spring.
 

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Re: what is a progressive suspension? (nightshift1983)

a progressive rate spring simply means that the spring rate increases progressively the further you compress the spring. This is done to provide a softer ride under normal driving conditions, but still reap the benefits of a higher spring rate when driving aggressively.
Most aftermarket springs are progressive. the progressive rate is achieved (depending on design) by varying coil spacing and diameter. Most progressive springs have tighter coil spacing at the ends of each spring while the center of the spring tends to allow larger spacing between the coils to allow easier travel. usually, you will be able to tell if a suspension kit uses a progressive rate spring just by the picture.
here's a pic of a progressive spring:

and here is a linear (non-progressive) spring:

As you can see from the examples above, the progressive spring will have a higher spring rate at the bottom coils, and a lower spring rate at the higher coils, when driving normal, compression of the suspension will only utilize the upper coils giving a smoother ride. But when you toss the car into a corner hard the suspension will compress much further using the top and bottom sections of coil in the spring providing a spring rate that increases the further the suspension travels.
the linear spring, on the other hand, will have a linear (duh) spring rate throughout each coil. because of the uniform spacing and diameter of each coil, the spring rate will stay the same the further you compress it.
hope that helped.
PS: the best thing to do if a manufacturer doesnt explicitly state whether the spring they use is progressive, is to call their tech line
 
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