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    Spring Rates For Jeep guys-

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    AllanR

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    Spring Rates For Jeep guys-

    Post by AllanR on Tue Jun 11, 2013 3:36 pm

    Spring Rates-

    Factory 6 cyl AT XJ Coil
    Wire dia: .5"
    Total Coils: 9 Active: ~8
    Coil OD: 5.0"
    Calc Spring Rate: 120 lb/in
    Tested Spring Rate: 125 lb/in
    Unloaded Height: 18.0"

    Old man EMU
    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.
    OEM is supposedly 147 lb/in rate. OME coils give 2.25" - 2.5" of lift and have a 148 lb/in rate

    PORC-
    XJ 6.5" 185 lbs/in (22.5" long)

    Pro-Comp-
    -Front Coils-
    TJ 2" 170 lbs/in
    TJ 4" 175 lbs/in
    XJ 3" 230 lbs/in
    XJ 4" 150-155 lb/in (19" Long) O.D. is 5.1" or 5.25"
    ZJ 3" 220 lbs/in

    RC's
    XJ 4" 155 lbs/in

    RockKrawler-
    XJ 3"
    XJ 4.5"
    XJ 4.0'' coils: Front: 190 lbs/inch Rear: 225 lbs/inch
    XJ 5.5'' coils: Front: 200 lbs/inch Rear: 235 lbs/inch
    XJ 6.5" are 165 lbs/in
    XJ 8" are 176lbs/inch

    Rubicon Express-
    ZJ 4.5in coils are 240 lb/in. (22" tall long)
    (RE 5.5XJ coils are 4.5ZJ coils.)

    RE lists the RE1345 spring as 5.5" XJ and 4.5" ZJ and that is the 185lb spring. They do not have a ZJ specific spring that is 240lb anylonger.
    (as of 2010)

    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"

    Rustys-
    XJ 3" 150 lb/in rate.
    XJ 4.5" 150 lb/in rate, 22" tall unloaded
    XJ 6.5" 150 lb/in (22" long), 12 wraps of 5/16" stock
    XJ 8.5-9" 180 lb/in

    Rusty's says "Most of our spring are built to 180lbs. Our 4.5" leaves are built to 150lbs. as are our 300 coils. The 305 coil is set to 180lbs."

    Sky Jacker-
    ZJ 3" coils 218 lbs/in

    Tera Flex-
    XJ 3" TJ coils have a 170 lb/in rate
    XJ 4" TJ coils have a 200 lb/in rate , 20.25" tall unloaded
    XJ 5" coils: Front: 240 lbs/inch Rear: 240 lbs/inch
    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

    Zone
    XJ 4" 240/lbs/inch

    http://www.jeepforum.com/forum/f11/springs-heights-their-spring-rates-613756/

    Coil Springs:
    BDS 3" XJ coil 240lbs/inch

    RE 3.5" XJ coil 241 lbs/inch
    RE 4.5" XJ coil 169 lbs/inch
    RE 5.5" XJ coil 185 lbs/inch
    RE 4.5" ZJ coils are 240 lb/in. give 5.5" ish of lift on an XJ
    )

    Rustys 3" XJ standard coil 150 lbs/inch
    Rustys 3" XJ Heavy Duty coil 180 lbs/inch
    Rustsy 4.5" XJ coil 150 lbs/inch
    Rustsy 6.5" XJ coil 150 lbs/inch
    Rustys 9" XJ coil 180 lbs/inch

    OME 930 XJ coil 160 lbs/inch ~2"
    OME 934 ZJ coil 180 lbs/inch
    Old Man Emu coil springs (A)= Driver side (B)= Passenger side

    DPGXJ5 DPG Trailgunner 5" coils = 198lbs/in.

    Rockkrawler 6.5" are 165 lbs/in

    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.

    Sky Jacker 3" ZJ coils 218 lbs/in ~4" on a XJ

    OEM is supposedly 147 lb/in rate.
    OEM ZJ with 4.0 is supposedly 190 lb/in rate front and rear.

    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


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