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Old 05-25-2015, 10:56 PM   #31
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Ok so I put the coils in. Jesus christ that took forever to get the clips just right to compress the spring was a nightmare, but after about 6 hours i was done. So now I have the ZJ coils in the front and the jk coils still in the rear as well as the jk shocks all around. I have to say I am pretty displeased with the results. I on purpose measured with one of the jk coils with the 3 inch spacer and in the passenger side and one of the new ZJ coils in the driver side with no spacers and the measurements were exactly the same. So now with both of the ZJ coils in the front with no spacers the jeep sits exactly the same as it did before. 6 hours of hard labor for nothing. I just don't understand this for the life of me. Should I put the stock tj coils that I still have in the rear instead of the jk coils? Or should I put the the front jk coils in the rear. So just so there is no confusion should I put either my stock tj coils in the rear or the front jk coils in the rear to level it out. Because as of right now it still looks just as retarded as it did before the ZJ coil install. Thank you everyone for your responses.
Just eliminating the coil spacers is a good first step. Now we need to fix that rake. Can you take some measurements of the front and rear springs as they sit compressed on the Jeep? Can you post as many pictures as possible of the rear springs? How about a pic of the Jeep on level ground? Using that info I can probably figure out what is going on.

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Old 05-26-2015, 09:48 AM
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Originally Posted by nfljohnl View Post
Ok so I put the coils in. Jesus christ that took forever to get the clips just right to compress the spring was a nightmare, but after about 6 hours i was done. So now I have the ZJ coils in the front and the jk coils still in the rear as well as the jk shocks all around. I have to say I am pretty displeased with the results. I on purpose measured with one of the jk coils with the 3 inch spacer and in the passenger side and one of the new ZJ coils in the driver side with no spacers and the measurements were exactly the same. So now with both of the ZJ coils in the front with no spacers the jeep sits exactly the same as it did before. 6 hours of hard labor for nothing. I just don't understand this for the life of me. Should I put the stock tj coils that I still have in the rear instead of the jk coils? Or should I put the the front jk coils in the rear. So just so there is no confusion should I put either my stock tj coils in the rear or the front jk coils in the rear to level it out. Because as of right now it still looks just as retarded as it did before the ZJ coil install. Thank you everyone for your responses.
Just eliminating the coil spacers is a good first step. Now we need to fix that rake. Can you take some measurements of the front and rear springs as they sit compressed on the Jeep? Can you post as many pictures as possible of the rear springs? How about a pic of the Jeep on level ground? Using that info I can probably figure out what is going on.
I mean do you think i should put the front jk or tj coils in the rear to level it out? I will send you pictures as soon as I'm home

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Old 05-26-2015, 11:25 AM
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From fender to the bottom of the tire it measures 34 inches in both fronts and 37 inches in the rear. Those ZJ springs i put in were like 10x as stiff and a little longer too. I was sure that my problem would be fixed.
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Old 05-26-2015, 02:40 PM   #34
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I am at 35" front/37" rear from ground to the bottom of the fender flare. So I guess I have a 2" rake. So either the JK rear spring is not seated correctly, they are giving you too much lift, or the ZJ springs are not working as expected.

Can you measure the actual compressed length of a front and rear spring now that they are installed on the Jeep? Then you can compare that to stock numbers to see how much lift you got and where your problem lies.

I would not put front springs in the rear. The Jeep was not designed to use springs that way. Post up some pictures and then maybe I can get a better idea of what you are working with.
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Old 05-26-2015, 02:55 PM   #35
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I am at 35" front/37" rear from ground to the bottom of the fender flare. So I guess I have a 2" rake. So either the JK rear spring is not seated correctly, they are giving you too much lift, or the ZJ springs are not working as expected. Can you measure the actual compressed length of a front and rear spring now that they are installed on the Jeep? Then you can compare that to stock numbers to see how much lift you got and where your problem lies. I would not put front springs in the rear. The Jeep was not designed to use springs that way. Post up some pictures and then maybe I can get a better idea of what you are working with.
I wish they would give us the spring rate constants so we could actually calculate if the springs would work or not.
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Old 05-26-2015, 04:17 PM
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I am at 35" front/37" rear from ground to the bottom of the fender flare. So I guess I have a 2" rake. So either the JK rear spring is not seated correctly, they are giving you too much lift, or the ZJ springs are not working as expected.

Can you measure the actual compressed length of a front and rear spring now that they are installed on the Jeep? Then you can compare that to stock numbers to see how much lift you got and where your problem lies.

I would not put front springs in the rear. The Jeep was not designed to use springs that way. Post up some pictures and then maybe I can get a better idea of what you are working with.
I read a few posts about the ZJ front springs in a tj and a lot of them do say to put the stock tj coils in the rear. I assumed this was a good idea because of the fact that the front springs are stiffer due to the heavy weight of the front of the tj as compared to the rear. You don't think this is a good idea?
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Old 05-26-2015, 05:13 PM   #37
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I read a few posts about the ZJ front springs in a tj and a lot of them do say to put the stock tj coils in the rear. I assumed this was a good idea because of the fact that the front springs are stiffer due to the heavy weight of the front of the tj as compared to the rear. You don't think this is a good idea?
That is one way to do it, and it works - but its not a great idea. The front springs are designed so that the coils collapse and stack on top of each other. The rear springs are designed so that the coils collapse around each other. Using the front springs in the rear means that the coils will ride closer to coil bind and are more likely to get damaged over time. They are also not the right shape to fit in the rear coil buckets and be stable under load. I would not recommend it, but it may solve your problem.
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Old 05-26-2015, 05:32 PM
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That is one way to do it, and it works - but its not a great idea. The front springs are designed so that the coils collapse and stack on top of each other. The rear springs are designed so that the coils collapse around each other. Using the front springs in the rear means that the coils will ride closer to coil bind and are more likely to get damaged over time. They are also not the right shape to fit in the rear coil buckets and be stable under load. I would not recommend it, but it may solve your problem.[/QUOTE]

Ok i understand now what you're trying to say. You're saying that it's not the right way to do it, but there is a possibility it will work for temporary use. Do you know of another way I can correct this damn rake on the front to level out the front and rear. I don't think the rear coils are the problem because I took pictures before and I think they're seated ok. What else can I do?
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Old 05-26-2015, 05:54 PM   #39
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Ok i understand now what you're trying to say. You're saying that it's not the right way to do it, but there is a possibility it will work for temporary use. Do you know of another way I can correct this damn rake on the front to level out the front and rear. I don't think the rear coils are the problem because I took pictures before and I think they're seated ok. What else can I do?
Well the easiest next option would be to get some ~2" coil spacers and use those and your OE TJ rear coils. That should get you 2" lift in the rear. I would measure your front ZJ springs and if they are around 14" then a 2" coil spacer will set you back to factory rake. The other option is to play around with more JK rear springs in the 54-46 range if you can find some near you.

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Old 11-28-2015, 10:21 AM   #40
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Alright, I want to bring back this thread as I am considering this swap again. John, do you remember if the zj coils gave you lift over the front stock tj springs? Because if I remember correctly, you said you swapped in the jk springs and got no lift, but then put it 3" coil spacers. That would be 3" of lift in the front right? Then you put in the zj coils and took out the coil spacers and it stayed the same. So in theory you got 3" of lift in the front over stock with the zj springs. Is that correct?

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