14/56 Coil Boost Advise

6433 Views 25 Replies 17 Participants Last post by DaisyCutter, Oct 11, 2015

JKCliffDiver

Discussion Starter · Nov 17, 2012

Hiya WF!

I've seen a couple threads on this but I may be reading waaaaayy too far into this...

I'm getting ready to pull the trigger on a JKU Coil swap onto my 2Dr Sport with 14/56's to both level it out and beef up the spring rate. Rather than just tossing on 19/60's which may most likely still present a factory rake, I kinda have crunched some numbers I'd like to see if y'all agree with...

One thing I've researched is seemingly the common consensus is you may gain 1/3" to 3/8" per part number step up. So based on that math, and my current config, the Mopar Coil P/N should technically offer:
19=1.6"-1.8"
18=1.3"-1.5"
17=0.99"-1.1"
....Aaaannd the rears should be:
58=0.66"-0.75"
59=0.99"-1.12"
60=1.32"-1.5"

Soo to achieve a decent coil leveling kit by using factory parts I should be sitting pretty with either a 18/58 or 19/59 setup to achieve about a 1.5" budget leveling lift, yeah?

Please dissect at your leisure

unk:

1 - 20 of 26 Posts

JeepJinx

· #2 · Nov 17, 2012

From what I have read in the link below...It looks like on a two door you can get about 1" for ever two digit jumps...say 14 to 16 in front. I am not sure if they go into the what amounts of lift you can get in the rear...but I did not read the entire thread.

Lets Solve the Stock Springs Question - Page 58

pluke the 2

· #3 · Nov 17, 2012

if youre plan is to "beef" up stock coils with JKU coils for any other reason besides getting them free, stop there. just my advice.

stock springs suck

71K5

· #4 · Nov 17, 2012 (Edited)

I put 19/60's with RS9000XL's(set on 3) on my 12' Sport. Nice ride with the Rancho shocks and not too much rake.
Gained approx. 1.7" front and 1.25" in the rear.
You can see before and after photos(look close) in my "Profile".
Note: I have the Mopar Offroad(120lb) rear bumper w/tire carrier. And the front is the stock bumper.

I have since added the Mopar Offroad (w/winch mount/80lbs) front bumper and Mopar Steel front skid plate(30 lbs). I have not installed a winch yet. So the front has come down a little. Approx. 1/4 inch or so.

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JKralph

· #5 · Nov 17, 2012

pluke the 2 said:
if youre plan is to "beef" up stock coils with JKU coils for any other reason besides getting them free, stop there. just my advice.

stock springs suck

this. unless you are getting the springs for stupid cheap, look aftermarket. you'll be happy in the long run.

JKCliffDiver

Discussion Starter · #6 · Nov 28, 2012

Thanks everybody for some good insight

...Sorry for the delay in the repost. Outta town for a while and just got back.

@pluke the 2 / JKralph - Yeah the current ones surely do. They are blasting onto the bumpstops just in heavy braking alone and my neighbor is gearing up to lift his JKUR with 18/58's here real soon so it got me thinkin'. I just want to weigh all options before pulling the trigger either way.

@71K5 - That is right about where I'm looking to be heightwise. :thumb: I'm curious if there were any adverse effects on your handling (bouncy, jarring, etc...)

@JeepJinx - That was quite the read, but some great info.

As I sit now, I have no need to lift any higher than 2" up front. At least not till after we have my kid.

What I want to achieve is no more bottoming out, and to give my duratracs somewhere to go other than against my fender on the trail.

So without veering too close to another lift thread, I'm just about split between the Stock JKUR coil swap, or the TF Performance leveling kit.

Thanks guys for all your help, sorry if I sound stuck in my uneducated ways

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JeepJinx

· #7 · Nov 29, 2012

JKCliffDiver said:
So without veering too close to another lift thread, I'm just about split between the Stock JKUR coil swap, or the TF Performance leveling kit.

Thanks guys for all your help, sorry if I sound stuck in my uneducated ways

Take a look at this thread...
It is one more choice that may work for you.
I wish I had seen a thread like it...

http://www.wranglerforum.com/f33/live-and-learn-when-it-comes-to-a-lift-199897.html

JKralph

· #8 · Nov 29, 2012

JKCliffDiver said:
Thanks everybody for some good insight ...Sorry for the delay in the repost. Outta town for a while and just got back.

@pluke the 2 / JKralph - Yeah the current ones surely do. They are blasting onto the bumpstops just in heavy braking alone and my neighbor is gearing up to lift his JKUR with 18/58's here real soon so it got me thinkin'. I just want to weigh all options before pulling the trigger either way.

@71K5 - That is right about where I'm looking to be heightwise. :thumb: I'm curious if there were any adverse effects on your handling (bouncy, jarring, etc...)

@JeepJinx - That was quite the read, but some great info.

As I sit now, I have no need to lift any higher than 2" up front. At least not till after we have my kid. What I want to achieve is no more bottoming out, and to give my duratracs somewhere to go other than against my fender on the trail.

So without veering too close to another lift thread, I'm just about split between the Stock JKUR coil swap, or the TF Performance leveling kit.

Thanks guys for all your help, sorry if I sound stuck in my uneducated ways

also, sounds like you need to consider extended bumpstops, those are what will truly prevent your tire going through your fender

topbanana

· #9 · Nov 29, 2012

I have done a JKU spring swap into my 2d, (2011 Sahara) it was a 18/17 front swap and a 58 rear. I kept the stock shocks. Your numbers are not far off, I achieved 1 inch in the front and .75 in the rear. I run 285/75-16 Dura Tracs on 8 X16 Ultra Drifter rims and have no bumpstop issues. (Goodyear claims those tires have an outside diameter of 32.8 inches). If you have to pay for the stock springs and installation, like the others reply to this thread, there are better options. Mine springs were free, (a "get them the hell outta my garage" deal) and installation was a buddy, me and a case of beer. My Sahara came with a dealer installed trailer hitch, not the factory's towing package, so beefing up the rear springs for trailering was one of the main missions of this swap. Placed side by side the rear springs were almost identical in height, but the 58 were thicker steel and hence hold the rear higher when they take the jeep's weight. I was expecting a rougher ride but the difference was unnoticeable on the street. Hope this is of some help.

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MLPeep

· #10 · Nov 29, 2012

I have a 2012 JK and went from -14 to -19 springs in the front, and from -56 to -60 rear, and installed a Teraflex JK 1.5” leveling kit (p/n 1155200) at the same time, using only (2) of the front 1” pucks.

I got + 2.5” front and + 1.625” rear.

norski74

· #11 · Nov 29, 2012

I did the spring swap. Went from 14/55's to 19/60's. This made a huge difference in ride quality. Less body roll, less dive and squat. I have a warn 8274 up front and still had to add a 1 inch spacer to have a more flat look. It only takes about an hour and a half to swap the springs per end. So your looking at about three hours to swap. Once you do it its faster. Just remember to disconnect your brake lines from the frame so not to pull them apart when you drop the axel down.

JKCliffDiver

Discussion Starter · #12 · Dec 7, 2012

Update...

So I'm pretty stoked! I was able to grab a full set 18/59's on eBay for $75! They are coming off a '13 JKUR w/ <20 miles. (Or so they advertise...) Thanks for the advise of waiting and trying to score them on the cheap! Can't wait to verify them part#'s in person and throw 'em in! :thumb:

I'll give it a while on the shocks, do some soul searching or whatever. Or take any feedback you guys got.

That was a good post on the ACOS coilover's and I'll keep an eye on those for after the warranty is up. No sense in permanent mods yet, just in case...

And thanks again for your feedback!

txsjpstr

· #13 · Dec 7, 2012

I'm considering the same thing. Post up some photos and let us know how the new ride compares to old.

mcgee10

· #14 · Dec 8, 2012

I went from 14/56 to 19/59 and added a teraflex leveling kit, bump stops and Rancho XL 9000 shocks, and manual disconnect. Also added 165 pound bumper and winch.
The excess body roll is gone, the front end dive also gone. The shocks set at 5 front and 3 rear on the road rides awesome off road 6 front and rear perfect. The bigger springs stiffened up the ride and the Rancho smoothed it out. It's 2 inches higher than stock. Until I find something wrong with this set up I'll stay with it. It rides great on road and off with just a quick shock adjustment.

JKCliffDiver

Discussion Starter · #15 · Dec 31, 2012

Finished Product...

Here it sits. Just got the 18/59's I snagged off ebay for $75 installed yesterday. Total time from start, to the end of final torque was 3 1/2 hours.

It may not look like much, and some may say "what was the point of this?" but the difference really shines through in spring rate! It doesn't seem to waste engine torque squatting on take-off, also doesn't bounce off the bump-stops when I slam on the brakes anymore either. :thumb:

All in all, It drives like these were the springs that Jeeps "should" come with out of the factory. It is no "true lift" but that was never the true intent. Still, it may see a budget TF leveling kit, (mostly for the QD sway bar links) but I'll have a better opinion soon, once I can get off the pavement hopefully tomorrow.

Things learned from this project:
1: Watch the ABS harness in the rear! - Even after warned by a previous post it still almost got me in a world of trouble. (front totally different than rear)
2: Have a buddy - I was lucky to involve my father in this, making it easy.
3: Tow straps are awesome! - Great tool to center the axles
4: Most importantly, Thanks WF and Project-JK for all the knowledge-base and torque spec's

vvv - After Pics.

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2

JKralph

· #16 · Dec 31, 2012

:appl: IMO throw a 1" spacer up front and call it good. Looks great!

onetraveller

· #17 · Dec 31, 2012

When you are ready for shocks, check out the Rancho 2" sport kit. It comes with the 9000 series shocks for not much more than you would pay for the shocks alone.

Mike

SilverSport

· #18 · Jan 1, 2013 (Edited)

Whoever says the stock springs suck needs to throw up some hard evidence and stop buying into the hype from aftermarket companies. Add weight to a spring and it will compress. Not the same thing as sag. Sag is when a spring collapses over time. 18s or 19s will be just fine.

Holton345

· #19 · Dec 28, 2013

silversport said:
whoever says the stock springs suck needs to throw up some hard evidence and stop buying into the hype from aftermarket companies. Add weight to a spring and it will compress. Not the same thing as sag. Sag is when a spring collapses over time. 18s or 19s will be just fine.

+1

JTPhoto JK

· #20 · Dec 28, 2013

SilverSport said:
Whoever says the stock springs suck needs to throw up some hard evidence and stop buying into the hype from aftermarket companies. Add weight to a spring and it will compress. Not the same thing as sag. Sag is when a spring collapses over time. 18s or 19s will be just fine.

Totally agree. I am still running my original factory 58s with 2.5" TF spacers (almost 7years and 150,000) and these springs are just fine. It took 3.5" springs in the front to level it out. And I do haul a heavy trailer every couple weeks.

Putting on heavy bumpers and armor compresses springs beyond their weight spec and that's why BBs are suggested for those wishing to lift who do not intend on adding heavy bumpers and armor.

1 - 20 of 26 Posts

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