Please help with figuring out suspension upgrade - JeepForum.com
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post #1 of 33 Old 11-04-2019, 05:26 PM Thread Starter
Rob K
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Please help with figuring out suspension upgrade

2011 KK Sport 50k miles with 16" wheels and tow package.


Suspension is getting worn out due to hauling heavy loads and towing. Starting to get a bit bouncy and sags more than it used to when hauling/towing. Tires are starting to cup also. I'm at 17.5" in the front and 18.25" in the back for ride height.



No hurry but by next summer I'm looking to upgrade from factory parts to a little stiffer spring and more hauling/towing capacity. Eventually I'll also make steel bumpers. Also looking to maintain the factory rake since I load heavy. I guess I could also get coil over shocks for the back to help with loads. Looking for maybe a couple inches of lift and slightly taller tire for better ground clearance off road. Getting a fair amount of sand and dirt in the cross members on rutted forest roads. Not sure I can go much more than a couple inches otherwise it likely won't fit in my old short garage. It's already pretty close.




First thing is to find specs for the factory springs. I have no idea if they are standard, medium or heavy duty. A wild guess would be medium since it does have the tow package. I would be surprised if they ever put heavy duties on a stock KK.
25591F 52109884AE front driver
25591F 52109883AE front passenger
25591F 52109894AE back driver
25591F 52109893AE back passenger

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post #2 of 33 Old 11-04-2019, 05:55 PM Thread Starter
Rob K
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Have been using all terrain tires for quite a few years but I'm looking to go with something a little more aggressive but not a full mud terrain tire. It looks like Duratracs would be a good choice.



My current tire is Goodyear Wrangler SR-A 235/70R16. These are 2 ply standard load tires. The next taller tire size that is common is a 245/75R16. Duratracs LT245/75R16 are rated higher load capacity 6ply load C tire. The Duratracs are a little slower speed rating 99mph vs 112mph of the SR-A's which is fine since I drive slow.
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post #3 of 33 Old 11-04-2019, 06:15 PM Thread Starter
Rob K
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Anyone know where I can find specs for the factory springs?
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post #4 of 33 Old 11-04-2019, 08:58 PM
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Rob - your Jeep sounds a lot like mine, and used similarly (although less towing and more forest service roads for me).

Mine's a 2011 Limited with the 18 inch (ugh) wheels, with about 50k miles.

After looking at this till i'm blind every night, I have in my amazon cart right now OME springs (HD front and back), and Bilstein shocks.

I have a friend who's kid plays hockey giving me four hockey pucks for bumps in the rears, and the terraflex for the front. Also the JBA rear shock washer/sleeve kit.

I will hit buy for all of that, probably tomorrow.

As for tires, I am limited with the 18 inch wheels. But, I am going with Falken Wildpeak A/T Trails, and am going to 30 inch over the stock 29.

That is the best kit/tires that I think I can piece together from all of the reading I've been able to do here and some other forums.

Not sure if that helps you, but I'm looking forward to getting it going now that I've decided.

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post #5 of 33 Old 11-04-2019, 09:00 PM
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As for factory specs, I've seen tommudd post the numbers on them, but I don't remember them offhand.

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post #6 of 33 Old 11-04-2019, 10:45 PM
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There is some spring talk in here - https://www.jeepforum.com/forum/f292...hocks-4316043/
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post #7 of 33 Old 11-05-2019, 03:38 PM Thread Starter
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Right now most of my towing is pretty lightweight, but it is usually done along with loading the cargo area extra heavy. Thus the need for stiffer springs. They obviously are sagging already given the ride height.
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post #8 of 33 Old 11-05-2019, 04:51 PM Thread Starter
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Looks like the OME 1.5" lift kit is pretty popular. Supposed to give around 2" of lift. JBA is supposed to be the place to get them from, but they seem to be out a lot of stuff right now. There are no specs listed for the kit. No info on what springs are in the kit. What the h? Is it a standard, medium or heavy duty kit? You can order all the components separately but they seem to be out of most of that stuff.


I read somewhere that you can add a 1/2" spacer in the back to get more rake or conduit nuts in front to level it out. I think the springs to get would be the heavy duty OME2927 and OME2731. I wonder how much rake the HD springs have with no spacers in front or back. Or do you just install the kit and then adjust as needed? Would be nice to have an idea though then I can have the parts ahead of time.


Can anyone confirm if these springs are going to be stiffer than stock KK with tow package? I need to increase capacity. I'm still trying to figure out stock spring specs.
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post #9 of 33 Old 11-05-2019, 05:29 PM
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Rob - here's the info from tommudd on a thread at jeepkj:

"OME 927s will give you 2.5 inches of lift and are rated at 400 lb
OME 926s will give you about 1.75- 2 inches and are rated at 375 lbs
OME 925s will give you about an inch and are rated at 350 lbs
stock is rated at 310 lbs
Either bilstein or OME shock with Bilsteins a bit cheaper
plus Teraflex front bumpstops "

I don't believe the tow package upgraded the springs. I am pretty sure that is just engine/transmission fluid cooling and a fan.

I am going with Bilstein 5125 in the rear and 4600 up front for shocks. I can get part #'s if you need them.

I am a novice, so take it for what it's worth.

The clevis lift up front will level it out from its current nose-down stance. I don't know about adding spacers in the rear to get more rake - seems a bit weird to me.

OME HD springs will be quite a bit stiffer than stock.

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post #10 of 33 Old 11-05-2019, 05:39 PM
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Also, JBA quit selling these kits for KK's. They do sell, however, an adapter kit necessary for rear Bilstein shocks. Honestly, I'm not quite clear yet on whether they are needed for the front also.

For the springs/shocks, I am at about 685 on Amazon. The Terraflex are around 50, and the Bilstein JBA kit is about 15. I got pucks for free to use as rear bump stocks.

So, about 750 for the whole thing.

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post #11 of 33 Old 11-05-2019, 05:42 PM
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One more - the front springs are 731 for HD use. Not sure what the numbers are for the others.

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post #12 of 33 Old 11-06-2019, 05:11 PM Thread Starter
Rob K
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You found it, thanks so much, that helps a ton! Now I understand JBA just hasn't updated their website. So it sounds like any of the springs listed will have more capacity than stock.


So was JBA the only place that was selling the OME spring and shock kit? I'm not finding the kit anywhere else with a google search. Do we need to by the pieces separately now?


From what I understand the OME shocks and springs are a matched set based on spring rate. How do you know what Blistein shocks match up with the OME springs if you decide to do that instead? I assume that someone has figured it out already.
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post #13 of 33 Old 11-06-2019, 07:34 PM
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I think JBA was one of the few that had the OME kit at a reasonable price. I've seen it elsewhere, can't remember - maybe Summit, 4x4 Warehouse, or Morris I think it is. Seems to run about $1k now.

Rough Country or Rocky Road or one of them has it also. Those places seem to want to insert their own parts to the kit though, as opposed to having it be just OME parts.

From cruising around a bunch of forums, these are the ones I'm getting:
front - 24-139168 (4600 series)
rear - 33-185552 (5100 series - for lifts and HD)

OME does make matching shocks. The rear is N132. The front is 90009. They are quite a bit more expensive than the Bilsteins.

The OME are said to be made to match the springs, but many folks seem to have substituted the Bilsteins and been happy with it. The rear stud that the shocks mount on doesn't quite fit the Bilstein, so you need the adapter kit from JBA, or some homemade version of it.

There aren't, I don't think, different OME shocks based on spring rate.

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post #14 of 33 Old 11-06-2019, 07:41 PM
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On JBA's website, you can still look in the KK section and find info on the individual parts. Just go to the front struts or rear coils section as opposed to the kit section.

From JBA's section on the fronts:

Springs to use in a 3.7L Gas Engine

OME2925 FRONT STANDARD COIL SPRINGS, GAS 3.7L, 1.50" LIFT, 1 SET,
OME2926 FRONT MEDIUM COIL (0-150LBS) SPRING GAS 3.7L, 1.50" LIFT, 1 SET
OME2927 FRONT HEAVY DUTY (150LBS - GVW) SPRING GAS 3.7L 1.50" LIFT
Springs to use in a 2.8 CRD Engine

OME2926 FRONT STANDARD COIL SPRING DIESEL, 1.50" LIFT,
OME2927 FRONT MEDIUM LOAD (0-110LBS) COIL SPRING DIESEL, 1.50" LIFT,
OME2790 FRONT HEAVY LOAD (110-220LBS) COIL SPRING DIESEL, 1.50" LIFT


Used with NS130 or NS131 shock/strut

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post #15 of 33 Old 11-07-2019, 08:14 PM Thread Starter
Rob K
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I checked out the sources you listed and none of them sell the basic OME spring and shock kit. Like you say, the ones that do put there own spin on the kit. Looks like I'm going to have to order parts separate now. I'll do some searching and study up on Bilstein shocks but probably will just go with the OME. Guess I'll start putting a list together.
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