JKU Springs - JeepForum.com

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post #1 of 27 Old 05-13-2013, 10:43 AM Thread Starter
wranglernut14
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JKU Springs

I think that i saw somewhere that if you put JKU springs in a Jk it will give you a small lift and do y'all see any problems with this?

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post #2 of 27 Old 05-13-2013, 10:57 AM
JoonHoss
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It all depends on which springs you have, and which springs you change to.

There is no difference between JK and JKU springs, only in the spring rates themselves

There will be a tag on the top coils of the springs, with the last two digits ranging from 13-19 upfront, and 53-60 outback.

A VERY generalized statement is that each numerically higher number could provide about 1/3" lift vs the previous number

Hoss

"Genius may have its limitations, but stupidity is not thus handicapped."
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post #3 of 27 Old 05-13-2013, 11:01 AM Thread Starter
wranglernut14
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how do i find that out? i have a 2012 Sport
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post #4 of 27 Old 05-13-2013, 11:04 AM
JoonHoss
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Quote:
Originally Posted by wranglernut14 View Post
how do i find that out? i have a 2012 Sport
For starters, go crawl under your jeep, and look for the little white (with a color stripe) tag attached towards the top of your front and rear springs, write those numbers down



Hoss

"Genius may have its limitations, but stupidity is not thus handicapped."
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post #5 of 27 Old 05-13-2013, 05:49 PM Thread Starter
wranglernut14
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52126314AC and its a brown tag
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post #6 of 27 Old 05-13-2013, 06:02 PM
JoonHoss
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So your fronts are 14's, And what about out back?

Hoss

"Genius may have its limitations, but stupidity is not thus handicapped."
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post #7 of 27 Old 05-13-2013, 08:15 PM
COLOUXJ
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Quote:
Originally Posted by JoonHoss View Post
For starters, go crawl under your jeep, and look for the little white (with a color stripe) tag attached towards the top of your front and rear springs, write those numbers down



Hoss
you have the front and rear springs labeled wrong there.
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post #8 of 27 Old 05-13-2013, 08:26 PM
JoonHoss
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Quote:
Originally Posted by COLOUXJ View Post

you have the front and rear springs labeled wrong there.
Yep, just noticed that myself :

Hoss

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post #9 of 27 Old 05-13-2013, 08:34 PM
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Does the ride quality get stiff? Harsh?

Today I added some nice RubiRed takeoff shocks to my 2013 Commando Green Sport S... now, about this coil spring swap stuff.

I have a light Jeep at the moment, no additional armor yet and the backseat is out. It's usually fairly empty as a daily driver. I'll load it up pretty good for camping trips and trail running and bagging some mountain passes this summer.

Eventually I plan on bumpers F/R and rock rails, prolly something underneath also. This will all add weight.

I feel pretty committed to running 32's... think that's fine for what I like to do. I had the stock SRA's switched to Silent Armor at the time of purchase. I like the tires so far. I don't plan to lift for tire clearance reasons...

anyway

I scored a set of 18/60 coils when I got the shocks. My current coils are 14/56.

If I install the 18/60's I'll prolly get some umm, errr, Loft?

For those who have done this, how would you describe the difference in ride? Any thoughts or comments appreciated
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post #10 of 27 Old 05-13-2013, 08:57 PM
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Quote:
Originally Posted by Havoc View Post
Today I added some nice RubiRed takeoff shocks to my 2013 Commando Green Sport S... now, about this coil spring swap stuff.

I have a light Jeep at the moment, no additional armor yet and the backseat is out. It's usually fairly empty as a daily driver. I'll load it up pretty good for camping trips and trail running and bagging some mountain passes this summer.

Eventually I plan on bumpers F/R and rock rails, prolly something underneath also. This will all add weight.

I feel pretty committed to running 32's... think that's fine for what I like to do. I had the stock SRA's switched to Silent Armor at the time of purchase. I like the tires so far. I don't plan to lift for tire clearance reasons...

anyway

I scored a set of 18/60 coils when I got the shocks. My current coils are 14/56.

If I install the 18/60's I'll prolly get some umm, errr, Loft?

For those who have done this, how would you describe the difference in ride? Any thoughts or comments appreciated
Going from 14/56 to 18/60, you should get close to 1 1/2" of increased ride height (call it what you want).
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post #11 of 27 Old 05-13-2013, 09:05 PM
Havoc
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Originally Posted by dualtjs View Post
Going from 14/56 to 18/60, you should get close to 1 1/2" of increased ride height (call it what you want).
Yea, I might get kinda dizzy up there

I've been reading these coil swap threads for awhile and i've seen some folks get persnikkety when the coil swap gets called a lift. I'm sure when I add some weight in armor and load it up that some of that 1 1/2" will drop.

I don't plan on the armor until next spring due to finances, so I was wondering if there are any bad effects or unintended consequences in swapping the coils now.

Is it an improvement over what I have now?
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post #12 of 27 Old 05-13-2013, 09:17 PM
dualtjs
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Quote:
Originally Posted by Havoc View Post
Yea, I might get kinda dizzy up there

I've been reading these coil swap threads for awhile and i've seen some folks get persnikkety when the coil swap gets called a lift. I'm sure when I add some weight in armor and load it up that some of that 1 1/2" will drop.

I don't plan on the armor until next spring due to finances, so I was wondering if there are any bad effects or unintended consequences in swapping the coils now.

Is it an improvement over what I have now?
Yeah, I come from the TJ forum. Given the age of some of them (e.g., mine which was almost 16 yrs old), the springs sag so there's a perpetual "discussion" as to that is "lift" vs return to stock ride height.

As far as unintended consequences... You are taking springs that were designed for a JKU and putting them in a JK, so... On the one hand, they were designed, by the manufacturer, to go into the components in which you are installing them (they were just designed for a vehicle that's ~600 lbs heavier). On the other hand, you are changing stock ride height, so there will be little things that will have to adjust (e.g., your axles will shift 1/4" or so, your shocks may not be the ideal length), but given the fact that we're talking about less than 2" (or 2" max, given some reports), the unintended consequences will be minimal and mostly cosmetic.
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post #13 of 27 Old 05-13-2013, 09:26 PM
Havoc
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Cosmetic... as in, "Do these coils make my tires look small"?

I think I'm gonna stand pat and hold the coils for now

Thanks!
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post #14 of 27 Old 05-13-2013, 09:29 PM
dualtjs
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Quote:
Originally Posted by Havoc View Post
Cosmetic... as in, "Do these coils make my tires look small"?

I think I'm gonna stand pat and hold the coils for now

Thanks!
I meant more along the lines of "your axle appears to be shifted 1/8" to the left", but depending on the tires, yes, they may look smaller.
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post #15 of 27 Old 05-13-2013, 09:34 PM
Havoc
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Quote:
Originally Posted by dualtjs View Post
I meant more along the lines of "your axle appears to be shifted 1/8" to the left", but depending on the tires, yes, they may look smaller.
If that happened, is that what a trackbar adjustment would fix?

Just starting to try to figure all this out and wondering if an actual lift would be a better plan
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