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Unread 11-27-2008, 06:38 PM   #1
Wheelin98TJ
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FAQ - Coil spring measurements

Below are the approximate heights of various TJ coil springs when sitting at ride height with the weight of the Jeep on them. The measurements are from the very top of the spring where it meets the isolator or coil bucket to the very bottom of the spring (again where it meets the isolator or coil mount).


tj-coil-spring-measurements.jpg

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Unread 11-27-2008, 06:43 PM   #2
never monday
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NICE!!!

Let's add if you have a larger than normal isolator. You'll need to add that measurement to the spring height to get the lift amount.
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Last edited by never monday; 11-27-2008 at 07:08 PM..
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Unread 11-27-2008, 06:51 PM   #3
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Quote:
Originally Posted by never monday View Post
NICE!!!

somewhere If I can find it I had a list of many of the aftermarket springs. Give me a few days....
Thanks for providing the measurements for stock springs and thanks for the suggestion to add this info to the FAQ.

At one time I also had a spreadsheet that I made based on email and phone calls to manufacturers. It had all kinds of info on aftermarket TJ coil springs including spring rate and measurements, but I gave up on it since I was sometimes getting conflicting info depending on who I spoke with at the company. I guess some manufacturers do not like to give out this info.
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Unread 11-27-2008, 07:04 PM   #4
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found it

From Rubicon Express customer service email to T.N. (November 2004):

The 3.5" TJ fronts are approximately 240 pounds per inch. Uncompressed free
length is 19"

The 4.5" TJ fronts are approximately 219 pounds per inch. Uncompressed free
length is 19.75"

XJ front springs
OEM is supposedly 147 lb/in rate.
Tera 4" TJ coils give 4.5" of lift on an XJ and have a 200 lb/in rate , 20.25" tall unloaded
Tera 3" TJ coils give 3.5" of lift on an XJ and have a 170 lb/in rate
Rusty's 4.5" coils give 5" of lift and have a 150 lb/in rate, 22" tall unloaded
RE's 4.5" ZJ coils give 6"-6.25" of lift on an XJ and have a 200 lb/in rate, 22" tall unloaded (RE ZJ coils are 240 lb/in)
Rustys 3" coils give 3" and have 150 lb/in rate.
Rancho 3" coils, at least the old coils give about 2 1/4" of lift on an XJ and have a very high 235 lb/in rate

Tera 4" TJ coils give 4.5" of lift on an XJ and have a 200 lb/in rate , 20.25" tall unloaded
Tera 3" TJ coils give 3.5" of lift on an XJ and have a 170 lb/in rate
Rusty's 4.5" coils give 5" of lift and have a 150 lb/in rate, 22" tall unloaded
RE's 4.5" ZJ coils give 6"-6.25" of lift on an XJ and have a 200 lb/in rate, 22" tall unloaded
Rustys 3" coils give 3" and have 150 lb/in rate.
Rancho 3" coils, at least the old coils I had give about 2 1/4" of lift on an XJ and have a very high 235 lb/in rate.
OEM is supposedly 147 lb/in rate.
OME coils give 2.25" - 2.5" of lift and have a 148 lb/in rate


OEM Old man EMU XJ is supposedly 142-147 lb/in rate. 17" length 5.25" diameter
OEM ZJ with 4.0 is supposedly 190 lb/in rate front and rear.
OME 930 coils: 160 lb. spring rate. 1.75" of lift on XJ
OME 934 coils: 180 lb. spring rate.The 934 spring is 35 mm (1.37") longer than the 930 spring.
The 930 is listed as a XJ or ZJ I-6 spring and the 934 is listed as a ZJ V-8 spring but is also used on the XJ. the 934 should give about 2.5in lift.

Tera 4" TJ coils have a 200 lb/in rate , 20.25" tall unloaded
Tera 3" TJ coils have a 170 lb/in rate

RE Rubicon Express 4.5in ZJ coils are 240 lb/in. give 5.5" ish of lift on an XJ 22" tall unloaded
RE 5.5XJ coils are 4.5ZJ coils.

Rusty's 6.5" 22" long, 12 wraps of 5/16" stock
Rusty's 4.5" coils give 5" of lift and have a 150 lb/in rate, 22" tall unloaded
Rustys 3" coils give 3" and have 150 lb/in rate.

Rancho 3" coils, at least the old coils give about 2 1/4" of lift on an XJ and have a very high 235 lb/in rate.

Rockkrawler 6.5" are 165 lbs/in

SJ Sky Jacker 3" ZJ coils 218 lbs/in
SJ 6in XJ RR coil is 13 coils and same height and thickness as the RE ZJ4.5in XJ5.5in coil.
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Unread 11-27-2008, 11:08 PM   #5
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thanks guys, just saved me a bunch of time!
any info on clayton springs? I was just trying to find the unloaded length of 4.5" xj springs...
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Unread 11-24-2009, 10:47 AM   #6
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Just saw this thread again while I was searching for GC spring rates. Didn't see it listed in the 'TJ Forum FAQ' sticky thread at the top.
As Joe Budden would say, (B)Pump it up.
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Unread 05-15-2010, 10:03 PM   #7
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added from another thread

In shore BDS lifts from 2" to 4" are:

BDS = Front 158 lbs.................... Rear 200lbs

For OME I found the Nov 2009 update catalog. It has everything from spring rates, wire diamater, number of coils, free height etc.. It also includes shock sizes and other infor. Here is the link were I found the pdf of the catalog.
http://www.jeeptoys.ru/2/!OME%20Cat%...9%20Update.pdf

Here are the main TJ/LJ rates and the OE rates as indicated in the catalog.

OME #.......... Spring Rate lbf/in........OE Spring rate Lbs

OME930.............162...........................1 40
OME931.............140............................ 140
OME932.............140............................ 140
OME933..............140........................... .140
OME934..............160........................... .140
OME949..............216........................... .160

New Table with extra info:

Spring ……….Diameter……Length A….Length B…….Rate……OE Rate

Front:
OME9330………..551……….19.49……….19.09……….140……….140
OME934……….0.5511……….20.08………19.68……….160……….140
2" BDS 034204…..0.563……….18.5……….18.5………158……….140
3" BDS 034302…..0.563……….19.5……….19.5……….158……….140

Rear:
OME941……….0.5905……….15.35……….14.76………. 140……….140
OME942……….0.6102……….14.96……….14.37………. 160……….140
OME949………..0.669……….14.57……….13.98……….216……….160
2" BDS 034206…..0.625……….13.75……….13.75……….200……….160
3" BDS 034308….0.625……….14.75………14.75………200……….160
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Unread 01-26-2011, 09:47 AM   #8
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so i have 14 inch springs and a two inch spacer thing. so i guess it is 4 inches of lift. nice. can i just get 6 inch springs and put in there or is there alot more to it than that?
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Unread 01-31-2011, 01:37 PM   #9
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I was confused by some discrepencies above, so I got these from ARB directly...

Code:
Part#    height mm A/B           spring rate lbf / in
OME932     480/470                      140
OME933     495/485                      140
OME934     510/500                      160
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Unread 02-02-2011, 09:20 AM   #10
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Here is a link to the OME parts catalog and it includes technical specifications on their springs:

http://www.arbusa.com/Uploads/PDF/on...de_current.pdf

Last edited by Wheelin98TJ; 04-29-2013 at 09:34 PM.. Reason: Link updated
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Unread 04-30-2011, 05:48 PM   #11
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How about a different measuring point cause someone might have coil overs... say stock bumper height with X size tires. Or even point on frame to ground or axle...
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Unread 02-22-2012, 05:26 PM   #12
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I have one question I mesuare and I get 16'' that means 4-3'' lift?
But my jeep only have 2''BB and stock springs. Im shure about the BB but not shure if i have stock springs.
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Unread 02-22-2012, 06:47 PM   #13
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Quote:
Originally Posted by wranglerTX View Post
I have one question I mesuare and I get 16'' that means 4-3'' lift?
But my jeep only have 2''BB and stock springs. Im shure about the BB but not shure if i have stock springs.
you are measuring wrong. based on the pictures in your build thread (linked in your sig), you have stock springs with a 2" BB, and stock isolators that are rotted and need replaced.

Here's new isolators:
http://www.quadratec.com/products/56020_100.htm
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Unread 02-22-2012, 07:12 PM   #14
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thanks^^
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Unread 02-22-2012, 07:29 PM   #15
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great info, is this going into the FAQ?
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