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- #21
Is it just me or is it confusing that the 2721 are 0" lift while the 2722 are 0.75" lift given both are the same height. and the 2721s have a progressive spring that's 270#/in & 350#/in while the 2722 are a linear 275#/in. i don't get it...More or less. You can't just go by free length. Spring thickness, number of coil wraps, length all affect the spring rate.
I did a paper comparison of a ton of springs here which will give you an idea. To be fair I don't even understand how springs are truly rated because if you compare the King Springs at the top to the Tough Dog ones you'll see they're the same spec yet they have different load ranges.
Rear spring recommendation
Ordered directly thru email with AirbagMan and they shipped DHL no prob. Actually just got the box today. Under two weeks for me @DRRichey did you have any trouble ordering from AirBagMan AU? I ordered their kit on eBay from ozautoparts and a few weeks later they cancelled my order with the...forum.ih8mud.com