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The Basics of Lift Kit Springs

Discussion in '4x4 Discussion' started by Evan, Nov 23, 2016.

  1. Evan

    Evan Administrator
    Staff Member

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    When you're looking at lifting your Jeep Wrangler, there's a few things to take into consideration. In this thread, we'll take a look at different kinds of springs, and what you get out of them for your ride. Many companies like Teraflex and Rubicon Express were known for single rate springs "back in the day", but as the dual and progressive rate springs became more popular, have adapted to the times. Now everyone from MetalCloak and Rock Krawler to AEV have "custom tuned" springs. What does this mean?

    Briefly - Single rate springs feature a constant and unchanging rate. The best example of this would be your OEM springs. Unloaded, the spring has even spacing throughout. Progressive springs will appear to be progressively "wound" tighter towards the top of the spring. Dual rate springs have a clearly defined top end (soft rate) and bottom end (firm rate).

    What does this mean for your Jeep? Basically, linear springs have less "droop", so you'll find progressive or dual rate springs in mid or long arm kits. This means that as the axle moves downward, the spring can remain seated in the vehicle. You'll often see pictures of linear springs falling out in extreme situations on the trail. For the progressive or dual rate spring, when offroad, the top end of the spring is free to flex, now that the load (vehicle weight) is taken off. This means that not only will the spring remain seated, it also means you'll have a better ride while on the trail!

    The upside to linear springs is that they're cheap to produce and will usually net you the advertised ride height. The more tuned springs however, such as AEV, are specifically designed for the AEV kit. For example, the AEV kit rides great, but may not do well if you start swapping out suspension components. As such, we recommend a full AEV kit, instead of trying to piece together your own with the AEV springs! Other companies may advertise heavy suspension setups (Old Man Emu comes to mind); these are for Jeeps with off-road bumpers and other heavy equipment, and could net you a bumpy ride if you're running the plastic OEM units. So remember, double check before you order, and if you have any questions, don't hesitate to give us a call!

    What do you run? Do you have success with an old-school set of single rate springs, or are you on the cutting edge with the custom-tuned multi-rate springs? Leave us some comments and pictures of your Wrangler, below!
     

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