Spring rates... - JeepForum.com

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post #1 of 16 Old 02-18-2013, 09:34 PM Thread Starter
kc2mrg
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Spring rates...

I know there was a thread about this a long time ago but I can't find it at the moment... I'm on my phone. Anyways can someone tell me what the stiffest spring would be in the 4"-5" height range? I do alot of towing and the Rustys 2.5" aren't cutting it. So... what is the best spring that won't sag when a heavy load is applied to them? And what will give me that "leaf spring truck like" ride?

And no... I don't want to sell it and get a xj or yj so don't go there lol

I know IRO makes 4.5" HD rear springs I just didn't know how heavy duty they are


2004 Grand Cherokee Laredo 4.0
Rusty's 2.5" coil/shock lift
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post #2 of 16 Old 02-18-2013, 09:49 PM
bradywgn71
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If I remember correctly, Clayton had the stiffest 4.5" set at around 210lbs. front and rear. IRO HD rears were something like 250lbs.

2002 WJ Overland - 4.7HO - 231tc - 6" Clayton - 285/75-16 Cooper STT - ProComp 5129 wheels - Kevin's Offroad Belly Skid and Rock Sliders - JKS Track Bar and Disconnects - ProtoFab bumpers
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post #3 of 16 Old 02-18-2013, 09:55 PM
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spring rate list thread

2003 WJ♦Inferno Red Limited(4.7 H.O., Vari-Lok axles)♦OME HD/BILLY 5100S♦IRO t-case skid, adj. tb, sway links♦Moog SS♦Factory tow package w/harness & tow hooks♦ Amp/12 sub box♦new bad b**ch passenger♦1993 XJ country♦lift/muds/winchbumper-sold♦build thread instead of long A$$ sig soon...
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post #4 of 16 Old 02-18-2013, 10:09 PM
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On the IRO website it says the heavy duty 4.5 inch rear shocks are 60% over stock. When you upgrade Ill take your rustys coils if they arent sagging!

2003 WJ♦Inferno Red Limited(4.7 H.O., Vari-Lok axles)♦OME HD/BILLY 5100S♦IRO t-case skid, adj. tb, sway links♦Moog SS♦Factory tow package w/harness & tow hooks♦ Amp/12 sub box♦new bad b**ch passenger♦1993 XJ country♦lift/muds/winchbumper-sold♦build thread instead of long A$$ sig soon...
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post #5 of 16 Old 02-19-2013, 06:11 PM Thread Starter
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Quote:
Originally Posted by PowderHound View Post
On the IRO website it says the heavy duty 4.5 inch rear shocks are 60% over stock. When you upgrade Ill take your rustys coils if they arent sagging!
No there not only have about 10-15k on them but I think my girlfriends dad wants them for his 02 wj but not 100% sure

2004 Grand Cherokee Laredo 4.0
Rusty's 2.5" coil/shock lift
265/70/16 General Grabber AT2's
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post #6 of 16 Old 02-19-2013, 06:14 PM Thread Starter
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Looks like according to that chart I could do some IRO rears and either Clayton or teraflex fronts...

2004 Grand Cherokee Laredo 4.0
Rusty's 2.5" coil/shock lift
265/70/16 General Grabber AT2's
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post #7 of 16 Old 03-14-2013, 02:20 PM
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Quote:
Originally Posted by PowderHound View Post
I emailed zone about the 4" springs, 240# front and rear was the reply..

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post #8 of 16 Old 03-14-2013, 02:27 PM
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The Teraflex WJ springs are discontinued unfortunately.

I'm a Clayton and IRO dealer if anyone needs any springs.

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post #9 of 16 Old 03-14-2013, 04:00 PM
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Anyone know the stock spring rate?

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post #10 of 16 Old 03-14-2013, 10:34 PM
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wjjeeps has them listed between 845-1085 lb, but this cant be inch/lbs. I think its total weight limit or something. I'm not sure how to convert the two. I was going to do the math but There is so many different standard spring rates for the WJ. I guess you would have to take a coil off and put weight on and see how much it would take to make it compress one inch. And I would guess that the rate is not constant thru the entire range of the coil. Any aftermarket coil is an upgrade and Kolak can get you the right setup. Those Cali girls in Bikini's will be wanting to wheel in no time LOL.
Just go with a good brand and you will be happy. Go with a heavier spring rate if you plan on towing or have added weight. Go with a lighter spring rate if you plan on flexing. Either way it's a win/win situation.

2003 WJ♦Inferno Red Limited(4.7 H.O., Vari-Lok axles)♦OME HD/BILLY 5100S♦IRO t-case skid, adj. tb, sway links♦Moog SS♦Factory tow package w/harness & tow hooks♦ Amp/12 sub box♦new bad b**ch passenger♦1993 XJ country♦lift/muds/winchbumper-sold♦build thread instead of long A$$ sig soon...
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post #11 of 16 Old 03-16-2013, 08:48 PM
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I saw the wjjeeps thing, didn't make a bit of sense. I can't come up with any way those numbers could be compared to the 175-250 pounds per inch rates of aftermarket coils. It'd just be nice to know if those 240 lb/inch BDS coils are replacing 125 pound stock coils or 200 pound stock coils..

If anyone has a stock coil laying around its not too hard to get a ballpark measurement of the rate.. a bathroom scale, a tape measure and a 2x4 can get close.

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post #12 of 16 Old 03-20-2013, 12:44 PM
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Wj Stock Spring Rate

i had e-mailed rocky-road a while back on some ome spring rates and they gave me a stock comparison. I was told that stock was 170# front and 160# rear. Take this how you will coming from rocky-road, all i have heard is bad about them.

On another note, this whole spring rate thing is driving me crazy, currently shopping for a lift myself.

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2002 Grand Cherokee Sport, OME HD lift, Bilstien 5100's, 63mm Bored t-body, IRO 2.5 exaust, 245/75/16 Revo2, Front tow hooks, 4.6L long rod stroker, Factory Jeep brush gaurd
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post #13 of 16 Old 01-04-2016, 05:17 PM Thread Starter
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also gonna bump this along with the other thread, just in case, has some good knowledge in it

2004 Grand Cherokee Laredo 4.0
Rusty's 2.5" coil/shock lift
265/70/16 General Grabber AT2's
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post #14 of 16 Old 01-04-2016, 08:08 PM
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BDS is the highest spring rate front and rear at 240 for both. The front are 4" and rear are 3.5". I believe tollmtn stated in a thread a while back, when we were discussing something similar to your situation, that the free hight and spring rate of the IRO HD 4.5" spings would match well with the 4" front BDS springs. I would say your best bet is BDS 4" front at 240 and the IRO HD 4.5" rears that are either 240 or 250. I have the 4 inch BDS springs (3.5 rear), and they actually ride really well. But there is a slight sag when loaded down.

Forgot to mention Zone (Both Zone and BDS are owned by Sport Truck USA) 4" front and 3.5 rear are also 240 each, it is the value brand lesser than BDS

Just some food for thought


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post #15 of 16 Old 01-05-2016, 06:27 AM Thread Starter
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Thanks for the input .. I've actually already bought a set of 4.5" Clayton Springs for mine but just figured I'd bump this for the good info incase anyone else was trying to find it

2004 Grand Cherokee Laredo 4.0
Rusty's 2.5" coil/shock lift
265/70/16 General Grabber AT2's
Superchips 3875 Flashpaq
Flowmaster exhaust


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