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Old 03-31-2012, 08:14 PM   #31
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Whats a new 4 door JK weigh?
Chrysler lists the base curb weights for 2012 JKs as follows:

2dr = 3,849 lbs
4dr = 4,231 lbs

Keep in mind that these base weights would be for soft top models with the manual trans and no extra options. This means no A/C on the 2dr.

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Old 03-31-2012, 08:17 PM   #32
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These are stock TJ weights that I found somewhere.

Sahara
Automatic: 3272
Manual: 3267

Sport
Automatic: 3221
Manual: 3216

SE
Automatic: 3080
Manual: 3060

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Old 04-02-2012, 10:09 AM   #33
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Here is something you may want to check. See if the number is the same for driver and passenger side. A cl post I was reading gave different # for every spring. 16 & 17 for front and 57 & 58 for the rear. Maybe jeep did what OME does and makes the springs position specific to compensate for engine tq.
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Old 04-02-2012, 10:50 AM   #34
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Here is something you may want to check. See if the number is the same for driver and passenger side. A cl post I was reading gave different # for every spring. 16 & 17 for front and 57 & 58 for the rear. Maybe jeep did what OME does and makes the springs position specific to compensate for engine tq.
I hadn't really thought of that, so this is a good question. When I looked around on Saturday to compile my "master" list, I usually looked at the right front spring only... though on a few Jeeps I also looked at the left spring instead because the right one's tag was in a position that couldn't be clearly read from the front. I never noticed any Jeeps with different part numbers.

As luck would have it, I was able to get a complete set of take-off shocks & springs from a new Sahara 4dr (AT, HT) just this morning. Both front springs have the same part number (52126316AC), and both rear springs also have the same part number (68004458AA). So at least in this Jeep's case, that theory is incorrect.
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Old 04-02-2012, 11:22 AM   #35
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Originally Posted by Sherpa

I hadn't really thought of that, so this is a good question. When I looked around on Saturday to compile my "master" list, I usually looked at the right front spring only... though on a few Jeeps I also looked at the left spring instead because the right one's tag was in a position that couldn't be clearly read from the front. I never noticed any Jeeps with different part numbers.

As luck would have it, I was able to get a complete set of take-off shocks & springs from a new Sahara 4dr (AT, HT) just this morning. Both front springs have the same part number (52126316AC), and both rear springs also have the same part number (68004458AA). So at least in this Jeep's case, that theory is incorrect.
Good to know! Also in the pic it looks like the OP has some rake . I wonder how much higher the rear sets then the front. Perhaps a 2 door spring in the rear would work to level the stance.
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Old 04-02-2012, 12:40 PM   #36
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I sat down with my parts manager this morning and we looked up information on my take-off hardware. As I feared, Chrysler's computer says nothing about exact spring rates. The only description for my hardware is "heavy duty suspension." Oh, well.
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Old 04-02-2012, 12:55 PM   #37
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I sat down with my parts manager this morning and we looked up information on my take-off hardware. As I feared, Chrysler's computer says nothing about exact spring rates. The only description for my hardware is "heavy duty suspension." Oh, well.
Just wondering if you could do for the rear what you did for the front with the part #'s. Also I wonder if the bump stops and jounce off a jk would work on the tj. This would save from needing to heat the rear spring .
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Old 04-02-2012, 02:20 PM   #38
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Just wondering if you could do for the rear what you did for the front with the part #'s.
Maybe. The front p/n was easy to read just by kneeling down and looking over the bumper. To read the rear p/n, I may need to get down on the ground and/or crawl under the Jeep... which I'm not fond of doing in dress clothes. Let me look into it.

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Also I wonder if the bump stops and jounce off a jk would work on the tj. This would save from needing to heat the rear spring .
I can't answer this question since I wasn't given those items--we re-used them with the new lift hardware. Anyone else know?
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Old 04-07-2012, 09:51 AM   #39
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I have actually seen a TJ lifted like this. His jeep looked awesome and he said the ride was amazing. He put JKU Springs off a soft top. The hard top JKU's have a stiffer spring to compensate for the heavier hardtop. Also, if you find springs off a hardtop with tow package, it will be even stiffer and will probably provide another inch of lift in the rear. I know that 2dr JK guys like to put 4dr/hardtop/tow package springs on their jeeps to get an extra 1.5-2" of lift from stock for cheap.

I have 2 sets of JKU soft top springs available in the classified section. I'm located in Tampa, Fl if anyone would like to get a set.
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Old 04-07-2012, 11:04 AM   #40
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Were there pics at one point in the thread? Cause they are gone now.
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Old 04-07-2012, 11:14 AM   #41
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Yes, the op posted a few pics, but for some reason they are gone now.
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Old 04-07-2012, 11:37 AM   #42
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Very cool info Jeepsr4me!
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Old 04-07-2012, 11:46 AM   #43
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I can't see the pics either I wish they were here. I have got all this stuff off of a 2010 Sport we just lifted. I have been looking at lifts to lower the 97 down some. This might be the answer since they won't cost me nothing. I might just try it and see what it's like before I order a lift. It would be time consuming to do it twice. Does anyone know where the pics went.
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Old 04-07-2012, 03:46 PM   #44
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Some more JK information

According to Jeep, each trim level of the JK receives a unique suspension. Using their terminology:

Sport = normal-duty suspension
Sahara = heavy-duty suspension
Rubicon = performance suspension

Jeep refers to both 2dr and 4dr models in this way, though my research has already shown the 4dr vehicles to receive different springs than their 2dr counterparts. This certainly makes sense due to the added weight of the LWB models.

Earlier, someone asked me to check out rear spring part numbers. I looked at a few new 2012 4drs just now and came up with the following:

Sahara: 68004458AA (paired with 52126316AC)
Rubicon: 68004459AA (paired with 52126318AC)

We have sold out of 4dr Sport JKs, so I wasn't able to check one of those. I'll have to edit that info into this post in the future.
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Old 04-07-2012, 08:56 PM   #45
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I went and got the coils and shocks out of the barn and brought them to the shop. I really don't see how you could get 3 inches of lift out of these.

The tags on my JKU Sport with tow package are:

68004458AA rear
52126317AC front

My front TJ is 52088129AB

rear is not real legible 52090105AA

The JK rears are 2.25 longer than TJ ones

Front's are only 1/2 inch longer

rear shocks 3" longer

front shocks 2' longer



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Old 04-08-2012, 06:25 PM   #46
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I'll add to your JK spring confusion. The Rubi and Sahara w/tow typically have the HD springs. Take the last two NUMBERS on the part number. The higher the number, the higher the spring rate. 19 is the highest for front and 59 is the highest for the rear. The higher the number the higher your lift MAY be.

Not only that, the left side is different from the right side (I'm assuming compensating for the fuel tank.) My Sahara had 17/18 front and 57/58 rear ('07 JKU w/ tow package).
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Old 04-08-2012, 07:22 PM   #47
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As for spring rates on the JK's. There is no real rhyme or reason to it. The last two numbers tell the story on the springs. The higher the number, the stiffer the springs. My '10 Sahara is listed with "heavy duty" suspension. Front springs are 13 and 14, the rears are 53s. Front spring #s range from 13-19, rears 53-60.
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Old 04-08-2012, 08:06 PM   #48
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I didn't see the pics, And when I had a JK, we measured stock springs off a TJ and JK side by side and where within a 1/2".. IIRC somewhere around 17", these where for the fronts, We didn't even bother with the rears.

Also I know that poly performance / synergy suspension lists there TJ/JK front lift springs with the same part number for a 3" lift. ...PPM-8063-20.

Just my observation is you may be able to get an 1" lift out of these if you use 4 door springs, but i certainly don't see 3"..

http://www.polyperformance.com/shop/...s-p-16404.html
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Old 04-08-2012, 08:15 PM   #49
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I didn't see the pics, And when I had a JK, we measured stock springs off a TJ and JK side by side and where within a 1/2".. IIRC somewhere around 17", these where for the fronts, We didn't even bother with the rears.

Also I know that poly performance / synergy suspension lists there TJ/JK front lift springs with the same part number for a 3" lift. ...PPM-8063-20

http://www.polyperformance.com/shop/...s-p-16404.html
Perhaps you didn't notice the jku gained 1.5" less then the tj and 1" less then the jk using the same spring .

Spring length has nothing to do with spring rate. A 2" ome spring is actually taller then my 3.5" re springs, so you shouldn't judge the hight gain by spring length.
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Old 04-08-2012, 08:55 PM   #50
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Perhaps you didn't notice the jku gained 1.5" less then the tj and 1" less then the jk using the same spring .

Spring length has nothing to do with spring rate. A 2" ome spring is actually taller then my 3.5" re springs, so you shouldn't judge the hight gain by spring length.
Yes, I know spring rates and vehicle weights will make a difference as well as progressive rate, vs. non progressive. I was just pointing out stock for stock, and comparing them against a single lift spring.

And JK's have been out for 5 years now, and someone is just now trying to swap out these springs . If they provided that much lift, this would have been news 5 years ago... lol
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Old 04-08-2012, 09:32 PM   #51
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Old 04-08-2012, 09:47 PM   #52
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Am I confused or what

The OP got 3" of lift putting JK springs on a TJ. The AEV guys put TJ springs on a JK for lift.
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Old 04-08-2012, 09:51 PM   #53
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Probably something to do with weight of the front ends and spring rate, progressive or not
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Old 04-08-2012, 10:00 PM   #54
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Quote:
Originally Posted by terminator012
am i confused or what

the op got 3" of lift putting jk springs on a tj. The aev guys put tj springs on a jk for lift.
x2
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Old 04-08-2012, 10:58 PM   #55
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Am I confused or what

The OP got 3" of lift putting JK springs on a TJ. The AEV guys put TJ springs on a JK for lift.
x3 That's what I was thinking but I wasn't sure
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Old 04-08-2012, 11:57 PM   #56
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This is good news to me, I just bought JK rubicon shocks cause I herd they would work with 2-3" of lift on my TJ. To save money I bought 2" BB to go with the shocks. Maybe I will scrap the BB idea and find some springs.
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Old 04-09-2012, 01:43 AM   #57
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I am thinking this might work. I have some 2" BDS coils meant for a XJ upfront. They measure the same length as my stock TJ coils but gave me atleast 2" lift as well as compensated for my heavy bumper and winch. I'm picking up a set of JKU Sahara shocks for the front this week to see how it rides.
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Old 04-09-2012, 03:22 AM   #58
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They didnt factor in which springs off of either JK or TJ or what model the vehicles were. It makes sense in my mind that when Jeep came out with the JK they were trying to target more daily drivers, so a softer spring would make it ride alot nicer around town, as to the TJ which was probably designed more as an OHV. Either way im still confused, weve got people telling us vice-versa stories here. My 2.5 Rancho springs are pretty blown out so im going to start looking for these JK springs and monitor the swap step by step and hopefully get to the bottom of this. ( oh and dont worry, plenty of pictures)
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Old 04-09-2012, 09:44 AM   #59
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At what height lift should you lower the transfer case ? If im just doing the a swap of the shocks and springs off of a 4 door 2008 sahara to a 2006 Rubicon (looking for a smoother ride) will i need to lower that down too ?
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Old 04-09-2012, 12:10 PM   #60
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At what height lift should you lower the transfer case ? If im just doing the a swap of the shocks and springs off of a 4 door 2008 sahara to a 2006 Rubicon (looking for a smoother ride) will i need to lower that down too ?
Very doubtful you would need to do a t-case drop.

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