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Thread: Fitting 37"s - 3.5" Coil lift w/ factory control arms vs. Long arms

  1. #1
    Old Timer Mike_JK_Houston_711's Avatar
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    Fitting 37"s - 3.5" Coil lift w/ factory control arms vs. Long arms

    So I was reading in the "newbie" suspension thread from a few years back and it was very helpful for the builds I have coming up. I do want some clarity around the question and answer below, though.

    "Q: At what lift height would I want to consider a Long Arm kit?
    A: On a Jeep JK Wrangler, you can safely run factory length arms up to about 4" of lift and without significant effect. However, you can benefit from the suspension geometry correction long arms provide at 3.5" of lift."

    In the next few weeks, I am putting in a 3.5" RK coil spring lift (with all necessary components - i.e. longer brake lines, rear sway bar links, je reel front driveshaft, 2" bump stops). I am also putting on 37" nitto trail grapplers about a week later. However, I am not doing anything to my factory control arms because I'm saving up for RK's X-Factor long arm kit around the end of the year. My question is - when the answer above states I can safely run factory length arms up to 4", does that mean I can use the factory control arms? Or is it implying I can run factory lengths, but need upgraded arms that come with the short arm kits, etc...

    Like I said, I'm going long arms in the next 6 months - but want to make sure I can still go wheeling on 3.5" and 37's on factory control arms, in the meantime. Understood this has probably been asked before, but I would appreciate any help/input/experiences.

    Thanks!
    B.O.D. Build - 2014 Granite Crystal JKU - http://wayalife.com/showthread.php?4...t-Build-Thread

  2. #2
    Caught the Bug
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    I would suspect that you would, at least temporarily, want to run some drop brackets or adjustable control arms to correct caster/pinion.

  3. #3
    Guy with a Red 2-Door cozdude's Avatar
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    You can run the factory arms. The only arms you will need to change is the front lowers to adjust caster and the rear uppers if you have a 2 door or 4 door with an aftermarket driveshaft.
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  4. #4
    Old Timer Mike_JK_Houston_711's Avatar
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    Quote Originally Posted by cozdude View Post
    You can run the factory arms. The only arms you will need to change is the front lowers to adjust caster and the rear uppers if you have a 2 door or 4 door with an aftermarket driveshaft.
    Ah, I was really hoping to get by with the factory arms until long-arms. The only reason I decided to do the 3.5 coil springs first was because after I installed my PR44, my adjustable track bar was hitting up against the front of the pumpkin with enough up and down travel (currently on 2.5" BB that has sunk quite a bit). So I needed to get more clearance immediately. If that rubbing wasn't happening, I would have just done the coils and long-arms all at once. Ugh, I might just wait it out and see how the driving feels after getting these coils in before pulling the trigger on more arms, just to swap them out again in 6 months. Thanks for the feedback though!
    B.O.D. Build - 2014 Granite Crystal JKU - http://wayalife.com/showthread.php?4...t-Build-Thread

  5. #5
    Guy with a Red 2-Door cozdude's Avatar
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    Quote Originally Posted by Mike_JK_Houston_711 View Post
    Ah, I was really hoping to get by with the factory arms until long-arms. The only reason I decided to do the 3.5 coil springs first was because after I installed my PR44, my adjustable track bar was hitting up against the front of the pumpkin with enough up and down travel (currently on 2.5" BB that has sunk quite a bit). So I needed to get more clearance immediately. If that rubbing wasn't happening, I would have just done the coils and long-arms all at once. Ugh, I might just wait it out and see how the driving feels after getting these coils in before pulling the trigger on more arms, just to swap them out again in 6 months. Thanks for the feedback though!
    Since you don't have an aftermarket rear driveshaft and you have a 4 door you don't need rear upper arms. Only the front lowers for caster adjustment.
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    October 16, 2013, wednesday early evening, east of the pacific ocean, selectee for truly random and boring Parking lot photo of the moment grand platinum prize winner!

    2011 JK
    EVO Bolt-on Coilovers, EVO 1/4 pounder w/ stinger, 37" Cooper STT Pros, PR44, and some EVO stuff

    Awaiting install-
    On Order-
    Want list- Evo carrier and skins, PSC hydro assis

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  6. #6
    Old Timer Mike_JK_Houston_711's Avatar
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    Quote Originally Posted by cozdude View Post
    Since you don't have an aftermarket rear driveshaft and you have a 4 door you don't need rear upper arms. Only the front lowers for caster adjustment.
    Okay, that's what I'll do then. Thanks for the advice. Anyone in the market for adjustable front lower control arms, message me in November HA!
    B.O.D. Build - 2014 Granite Crystal JKU - http://wayalife.com/showthread.php?4...t-Build-Thread

  7. #7
    Caught the Bug Static83's Avatar
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    Or just get geometry correction brackets for 100 bucks

  8. #8
    Old Timer Mike_JK_Houston_711's Avatar
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    Quote Originally Posted by Static83 View Post
    Or just get geometry correction brackets for 100 bucks
    Like this?

    http://www.rubitrux.com/aev-geometry...vzUaAjII8P8HAQ
    B.O.D. Build - 2014 Granite Crystal JKU - http://wayalife.com/showthread.php?4...t-Build-Thread

  9. #9
    Guy with a Red 2-Door cozdude's Avatar
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    Quote Originally Posted by Mike_JK_Houston_711 View Post
    I would NOT get geometry correction brackets. Think of it this way. You lift you jeep to get it away from the ground. All these do is lower the arms back down and put them back in harms way and make it so you don't have as much clearance.
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    October 16, 2013, wednesday early evening, east of the pacific ocean, selectee for truly random and boring Parking lot photo of the moment grand platinum prize winner!

    2011 JK
    EVO Bolt-on Coilovers, EVO 1/4 pounder w/ stinger, 37" Cooper STT Pros, PR44, and some EVO stuff

    Awaiting install-
    On Order-
    Want list- Evo carrier and skins, PSC hydro assis

    jlwrangler.com

  10. #10
    Not That Kind of Engineer olram30's Avatar
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    Quote Originally Posted by cozdude View Post
    I would NOT get geometry correction brackets. Think of it this way. You lift you jeep to get it away from the ground. All these do is lower the arms back down and put them back in harms way and make it so you don't have as much clearance.
    I agree. Just a good quality set of lca's is all that's needed.

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