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ZJ and WJ Grand Cherokees (1993 - 2004) Technical forum for the classic ZJ and WJ Grand Cherokees.

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  #1  
Old January 13th, 2018, 20:15
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ZJ coil spring question

I got in our 1998 Grand ZJ and noticed something was wrong. The rear passenger coil had almost completely collapsed with maybe a .25 inch of down travel left in the shock. The entire rear looks like it's sagging pretty bad now. The ZJ only has 167,000 miles on it. This thing is a DD so I'm surprised that it fatigued at such low (to me) mileage. Anyone ever had this happen?
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Old January 14th, 2018, 07:35
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Re: ZJ coil spring question

Did the spring break? Never seen something like that. Post any pics? Interested in what it looks like.
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Old January 14th, 2018, 11:59
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ZJ coil spring question

Messed up pic.
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Last edited by PacificEd; January 14th, 2018 at 12:18.
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Old January 14th, 2018, 12:05
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ZJ coil spring question

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Here is the passenger rear spring.




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Old January 14th, 2018, 15:22
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Re: ZJ coil spring question

This sounds nuts but this morning it was still sagging. I went outside at 2:30 pm to tinker with it and it’s back up at ride height. What the.......? I took it for a drive and it was fine. I’m thinking the shocks were frozen? Is that possible? The shocks are of unknown age and are mounted piston up which I’m guessing has allowed moisture in.
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Old January 15th, 2018, 20:30
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Re: ZJ coil spring question

Since the shocks were of questionable age and brand, I pulled the trigger and ordered a set of Bilstein 5100 shocks for the ZJ. My future plans are to go to OME HD 2.5" lift coils down the road, so the shocks are ordered to work with the future coils. The Jeep currently has a 2" BB lift puck in there now so everything should be good until the future mods begin.
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Old January 16th, 2018, 19:27
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Re: ZJ coil spring question

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Originally Posted by PacificEd View Post
This sounds nuts but this morning it was still sagging. I went outside at 2:30 pm to tinker with it and itís back up at ride height. What the.......? I took it for a drive and it was fine. Iím thinking the shocks were frozen? Is that possible? The shocks are of unknown age and are mounted piston up which Iím guessing has allowed moisture in.
Well that's bizarre. Definitely seems like a shock issue tho like you said. I've seen some struts totally lock up before so doesn't seem totally out of the question.
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Old January 16th, 2018, 19:42
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Re: ZJ coil spring question

The shock issue does make sense. Especially since you don't get as hard of cold weather as others...and it's been cold lately.

mac 'it is odd' gyvr
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Old January 18th, 2018, 06:50
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Re: ZJ coil spring question

I asked the guys at O'Reilly's that I do a lot of business with about frozen shocks and what could have caused what happened. They said they have never seen shocks freeze and were really at a loss as to what could have happened.

Hopefully the shocks will be here soon so I can check this off my list of things to do.
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Old January 28th, 2018, 15:01
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Re: ZJ coil spring question

I got the Bilstein shocks but I'm worried that since the coil compressed once, it might do it again. I'd sure hate to ruin a new shock.

What do you guys think?
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Old January 28th, 2018, 18:05
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ZJ coil spring question

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Originally Posted by PacificEd View Post
I got the Bilstein shocks but I'm worried that since the coil compressed once, it might do it again. I'd sure hate to ruin a new shock.

What do you guys think?


Im not sure what you are worried about exactly?

mac Ďmore deets plsí gyvr
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Old January 28th, 2018, 19:20
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Re: ZJ coil spring question

I've made the assumption that the compressed coil issue was solely shock related. If a coil collapses like mine did and then comes back to normal, can it be ruled out as the cause of the ZJ sagging? If I install the new shocks and it turns out the coil is weakened, and the coil fails again, the shock will beat itself since it becomes the part that limits travel.
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Old January 28th, 2018, 19:25
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Re: ZJ coil spring question

lol i think you are over thinking this

i'd put the shocks on it and call it a day...

mac 'not your dads leaf springs' gyvr
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Old January 28th, 2018, 19:29
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Re: ZJ coil spring question

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lol i think you are over thinking this

i'd put the shocks on it and call it a day...

mac 'not your dads leaf springs' gyvr
I have a tendency to do that. Thanks for the input.
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Old January 28th, 2018, 20:22
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Re: ZJ coil spring question

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Originally Posted by macgyvr View Post
lol i think you are over thinking this

i'd put the shocks on it and call it a day...

mac 'not your dads leaf springs' gyvr
Agreed. It would be the first instance I've ever heard of a coil intermittently sagging. I think you'll be fine.
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