Jeep spring rate chart

#1
This I've found very helpful. Covers XJ/TJ/ZJ

From http://www.pirate4x4.com/forum/showthread.php?t=259408

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.



From http://www.pirate4x4.com/forum/showthread.php?t=111316
Pro-Comp 4" coils:

uncompressed length=19"
Spring Rate=150-155 lb/in
I think the O.D. was 5.1" or 5.25"



From http://www.pirate4x4.com/forum/showt...threadid=87811

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.
OME coils give 2.25" - 2.5" of lift and have a 148 lb/in rate



From TeraFlex customer service email to T.N. (June 2004):

TJ springs
SR3T- Free length= 15" Spring rate= 190
SR4T- Free length= 15.38" Spring rate= 210
SF3T- Free length= 19.5" Spring rate= 170
SF4T- Free length= 20.25" Spring rate= 200


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"


"Big Bronco" SPring info here: http://www.patricksnorton.com/bronco/lifttech.html



From NAXJA: http://www.naxja.org/forum/showthread.php?t=14157

Here's one I've accumulated over the years from various peoples postings. Take it with grain of salt....

Spring Coil Rates:

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


Please feel free to add to this as I'm sure it doesn't cover everything. Most of it is from Pirate.




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