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Old 09-14-2012, 03:09 PM   #1
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Sagging rear coil springs

Question; I have Currie 4" coil springs and the rears are sagging under a load more than I am willing to accept. Currie doesn't make a heavy pair yet for the JK's like they do for the TJ/LJ's so I am looking at the Synergy's JK rear lift coil springs.

Not sure if I would need to get the 4.5" or 6" springs to keep the 4" lift I want. I have a Genright rear tire carrier (steel for now) and a 35" spare (will be going to 37" eventually) and I also have heavier steel rock sliders but may be going with lighter aluminum ones. I also tend to load up the ass end pretty heavy when traveling out of town so basically the load varies if that helps any.

Input on Synergy (poly performance) springs please if you have it. Thanks
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Old 09-14-2012, 03:15 PM   #2
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I purchased their springs because I had Heavy Duty OME coils that rode really stiff. I don't have much armor, nor bumpers, or very much extra weight. But I can tell you, before when I had OME Coils they never sagged and they were meant for load carrying a all time. I never had to use a spacer.

With my new coils, poly 4.5" coils, they haven't sagged (been on 4 months) but I did have to put in a 1" spacer in the front just to level the rig out because it came pre raked...

The ride difference for me is night and day. Love the Poly coils better because I don't have any weight. But if I had to choose a company that had heavy duty ass coils made for running heavy loads all the time, I would take OME over Poly, Teraflex, and Pro Comp. I've had experience with those 3 companies.

Poly 4.5" Coil with some 40's will do the job.



Poly 4.5" with 35's



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Old 09-14-2012, 03:17 PM   #3
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i love that poly performance has progressive springs and i would probably never go back to a regular linear spring ever again
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Old 09-14-2012, 03:23 PM   #4
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sorry not really answering the other part of your question. but i think all springs will sag over time. how much will they sag probably depends on the quality of them.

but when i installed these springs i got the advertised lift height from them not much more.
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Old 09-14-2012, 03:29 PM   #5
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Yup I run Heavy Duty OME's on my Land Rover Discovery with Bilsteins and know that if you drive it unloaded it's like driving my big dually around. They aren't progressive springs like the Currie's or the Synergy's. I won't ever go back to a linear spring either.

Without the Genright tire carrier and without the sliders, the lift sits pretty level but I did lose 1" on the ass end over the 4" Mopar lift I had on it originally. The ride with the Currie lift and springs is fantastic. Totally smooth but they are pretty known for having saggy asses which is why they made a heavy duty rear spring for the TJ/LJ's. Really surprised they didn't automatically do that for the JK's...dunno.
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Old 09-14-2012, 03:33 PM   #6
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Oh yeah, I guess the other alternative is to go to an adjustable spring spacer but I really wasn't looking to do that sort of fix unless it was the absolute best thing to do v/s replacing with taller springs...
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Old 09-15-2012, 10:34 AM   #7
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Bump
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Old 09-15-2012, 10:40 AM   #8
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Old 09-15-2012, 11:02 AM   #9
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Bump
you bumped and reported the thread saying "bump"
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Old 09-15-2012, 02:44 PM   #10
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i know i screwed the pooch!
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Old 09-17-2012, 07:54 PM   #11
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Thanks for the kind words guys, let me know if you have any other questions!
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Old 06-07-2013, 01:37 PM   #12
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Quote:
Originally Posted by pluke the 2 View Post
I purchased their springs because I had Heavy Duty OME coils that rode really stiff. I don't have much armor, nor bumpers, or very much extra weight. But I can tell you, before when I had OME Coils they never sagged and they were meant for load carrying a all time. I never had to use a spacer.

With my new coils, poly 4.5" coils, they haven't sagged (been on 4 months) but I did have to put in a 1" spacer in the front just to level the rig out because it came pre raked...

The ride difference for me is night and day. Love the Poly coils better because I don't have any weight. But if I had to choose a company that had heavy duty ass coils made for running heavy loads all the time, I would take OME over Poly, Teraflex, and Pro Comp. I've had experience with those 3 companies.

Poly 4.5" Coil with some 40's will do the job.
Sorry to awaken an old thread but this thread is getting right to the issue that I'm currently facing. After 4 years and 32000 miles on my Full Traction 3" coils, they are sagging bad. I also recently added a rear bumper/tire carrier and front bumper with winch and with those additions, I dropped about 1.5". Additionally, when I load it up with camping gear, the rear sags horridly - to the point where it bottoms on small potholes (on dirt fire roads)..

So, I was planning on upgrading my coils to the PP/Synergy 4" coils but it was brought to my attention that those may provide "too much" lift. "Too much" in the sense of having a steep pinion, being top heavy, etc..

What that leaves me is with a decision to make between either MetalCloak 3.5" coils or PP/Synergy coils. I notice you have the 4.5" coils and I'm wondering how different they are from the 4" coils.. I have a "full" lift kit (all arms and trackbars are adjustable, etc.).

I'm currently running BFG KM2 35x12.5x15's, 3.75" BS. There is a good chance that my next tires will be 37's.
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Last edited by JeepingGreen; 06-07-2013 at 01:41 PM.
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