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Thread: WRITE-UP : HOW TO Determine the Actual Amount of Lift on Your JL WRANGLER

  1. #1
    Administrator wayoflife's Avatar
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    WRITE-UP : HOW TO Determine the Actual Amount of Lift on Your JL WRANGLER

    With the exception of a budget boost or coil spacers that come in an exact size, it can be difficult to determine just how much lift, a lift kit has actually given your Jeep JL Wrangler. Certainly, just because a kit states that it offers 2" of lift, 3" of lift or more, that doesn't always mean that's what you'll ultimately get. In fact, more times than not, lift coils will end up yielding more lift than is advertised and a lot of this is because manufacturers anticipate that you'll be loading up your Jeep with heavy bumpers, rocker guards, armor and gear. Of course, there are some kit that eventually offer a lot less lift and this is caused by poor design and/or specs that lead to significant spring sag and/or the over compression of your coils.

    Being Cindy and I will most likely install multiple lift kits in the years to come, we thought it would be a good idea to locate fixed points on our JL Wrangler, take measurements of them while it's still stock and then use them as a baseline for future reference. While we do have a 4-Door JL Wrangler Rubicon Unlimited and the images you see below are from it, I have been able to get measurements from a 4-Door Sahara Unlimited and I've listed them as well. I should note that the measurements you see may not be exact to what you'll find on your JL Wrangler or even when comparing your passenger side to driver side but they should all be within +/- 0.25". Being that I haven't had a chance to take measurements on a 2-Door, I can't say with any certainty that these numbers will be the same for it.

    STOCK FRONT MEASUREMENT
    For the front of our JL Wrangler, we decided to take our measurement from the bottom edge of the upper spring perch to the top of the steel plate on the lower spring perch. As you can see, this gave us the following measurement:

    RUBICON = 10.25"
    SAHARA / SPORT = 9.5"




    STOCK REAR MEASUREMENT
    On the rear end of our JL Wrangler, we took our measurement from the bottom of the frame rail, just behind the bump stop cup and down to the steel bump stop plated located on the axle. As you can see, this gave us a measurement:

    RUBICON 6.5"
    SAHARA / SPORT = 6.25"




    After installing a suspension lift, all you need to do is take measurements from these points and the difference you'll see will be the amount of lift your kit actually provided. It is important to note that new coils will tend to sit MUCH TALLER soon after being installed and for more accurate results, you'll want to let them settle in a bit before taking these measurements.

    Hope this helps you out. Please let me know if you have any questions.

  2. #2
    Knows a Thing or Two BillArnett's Avatar
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    Too bad you didn't do this when it was brand new. It would be interesting to know how much the springs soften up after a few hundred miles. Also, did you notice any left/right differences?

    (And of course, you have to account for the extra weight of all those decals you added :-)

  3. #3
    Administrator wayoflife's Avatar
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    Quote Originally Posted by BillArnett View Post
    Too bad you didn't do this when it was brand new. It would be interesting to know how much the springs soften up after a few hundred miles. Also, did you notice any left/right differences?

    (And of course, you have to account for the extra weight of all those decals you added :-)
    LOL!! Honestly, I doubt the springs would be a change in measurement from zero miles and 1,000 miles but even if there was, I'd prefer to know what that measurement is once the coils have settled. Same is true of a new lift - I'd rather know what the final height is after the coils have settled instead of initial height.

    Regarding left to right measurements, yes, I did see about a 1/16" plus or minus difference. But of course, a full tank of gas could account for this and so rounding out to the nearest 1/4" is what I chose to go with.

  4. #4
    Resident Smartass OverlanderJL's Avatar
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    Good info to know. Will be interesting to see some numbers when people get coils installed.


    Sent from my iPhone using JL Wrangler Jeep Forum mobile app

  5. #5
    Caught the Bug
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    did you measure the body mount pads to see if they're taller than the JK?

    don't make me go out and buy one to find out ...hahahaha

  6. #6
    That dude from Mississippi notnalc68's Avatar
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    Iím glad you did this. I like the watermarks, too!


    Sent from my iPhone using JL Wrangler Jeep Forum mobile app

  7. #7
    Hooked TrailHunter's Avatar
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    Interesting... I just measured my stock 17JKUR from the same points and here is what I got...

    Front - 9”

    IMG_6901.jpg

    Rear - 6”

    IMG_6902.jpg


    I was expecting a bigger difference at the rear.... maybe the mounts/frame are different though.

  8. #8
    Fresh Catch
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    2" .mopar lift

    We measured from the floor to the center fender opening, wasnt too concerned as I was just happy we had a kit,they are back ordered ,
    Here in az,
    we also had a std unlimited jl to compare too, it also measured almost 3"

  9. #9
    Nothing but a Thing
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    When doing this too know that the Sport, Sahara and Rubicon all have different suspension lift heights. These are great numbers for the Rubicon. For Sport subtract an inch and for Sahara subtract about 3/8" on what those factory heights were. So if you get a true 2.5" lift that's 2.5" over a Rubicon it will really be 3.5" over a Sport or 2 7/8" over a Sahara.

    Sent via....

  10. #10
    Administrator wayoflife's Avatar
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    Quote Originally Posted by 13_gecko_rubi View Post
    When doing this too know that the Sport, Sahara and Rubicon all have different suspension lift heights. These are great numbers for the Rubicon. For Sport subtract an inch and for Sahara subtract about 3/8" on what those factory heights were. So if you get a true 2.5" lift that's 2.5" over a Rubicon it will really be 3.5" over a Sport or 2 7/8" over a Sahara.

    Sent via....
    Awesome info - thanks for clarifying things with this

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