Suspension and brake stats (FE1, FE3, FE5, J41, JM4, JL9)

Discussion in 'Suspension' started by YelloEye, Sep 27, 2009.

  1. YelloEye

    YelloEye Super Moderator Staff Member

    Likes Received:
    Jul 18, 2009
    Renton, WA
    This is not my original work, all credit for making this goes to Halfcent of ***.net If this should be taken down please just let me know and I will remove it myself.

    Thanks to Maven for a lot of info. Instead of re-posting here, look below for a nice part number list.

    The suspensions:
    Starting with the FE1, and then the changes with each up-level system

    FE1 suspension
    19-mm front stabilizer bar
    16-mm rear stabilizer bar
    Stamped steel front lower control arms

    FE3 suspension
    22-mm front and rear stabilizer bars
    Cast aluminum front lower control arms
    FE3 shocks and springs

    FE5 suspension - 2005-07 years
    24-mm front stabilizer bar
    22-mm rear stabilizer bar
    FE5 shocks and struts. The springs may be different from some FE3 models.
    Larger front end links

    FE5 suspension - 2008 and up years
    24-mm rear stabilizer bar
    NEW FE5(LNF) shocks, struts, and springs.
    Updated front knuckle

    The Brakes
    Brake systems are independent of suspension system, even though many parts are dependant on each other

    Front disc; 256mm x 23.69mm front rotors, 50mm single piston iron calipers
    Rear drum; 50mm single piston iron calipers, 9.06" rear drums
    4x100 wheels

    Same as J41 but with ABS
    (LS/LT w/ABS)

    5 Lug JM4
    ABS front disc; 276mm x 23.69mm rotors, 52mm single piston iron calipers
    Rear drum; (unchanged except for 5 lugs)
    5x110 wheels
    (LT w/ABS and upgraded wheels, LT2, 2009 LT2 Sport)

    ABS 4 wheel disc; 296mm x 26mm frt rotors, 54mm single piston iron calipers
    Rear; solid 270mm x 14mm rear rotors, 38mm single piston iron calipers
    5x110 wheels
    (SS/SC, SS/NA, 2.4L Sport)

    ABS 4 wheel disc; 315.5mm x 26mm frt rotors, 38mm 4 piston Brembo aluminum calipers
    Rear; vented 292mm x 19.9mm rear rotors, 40mm single piston iron calipers
    5x110 wheels

    The Cars
    These are just Cobalts. If anyone can fill me in on G5's, Ion's or HHR's, I'll add that.


    Base, LS, LT - FE1 with J41 or JM4
    SS/SC - FE5 with JL9

    2006 - 07

    LS, LT, LTZ - FE1 with J41, JM4, or (2007) 5-lug JM4
    SS/NA - FE3 with JL9
    SS/SC - FE5 with JL9

    2008 (updated FE5 specs began this year)

    LS, LT - FE1 with J41, JM4, or 5-lug JM4
    Sport - FE3 with JL9
    SS/TC - FE5 with JL9(LNF)


    LS, LT - FE1 with J41, JM4, or 5-lug JM4
    SS/TC - FE5 with JL9(LNF)

    Part interchangeability

    So far, and to the best of our collective knowledge, every single suspension part is completely interchangable between models. Some rules apply, which are listed here:

    1. If you change the front anti-sway bar, you must be careful to get the proper model year. The FE5 front bar mounting changed between 2005-06. It appears the simple trick it to just get the 2005 FE5 parts to insure compatibility.

    2. You can change the rear FE1 axle to an FE5 axle. The FE5 axle has provisions for mounting rear disk brakes. So you either have to cut those off to put on your drums back on, or you have to convert to rear disks. Converting to rear disks does NOT mean you have to convert to 5 lug hubs, but you are going to have to find some 4-lug rotors!

    3. Knuckles are the same on every suspension up through 2007. In 2008, the FE5 knuckle was updated with various improvements for bump steer. It is NOT interchangeable. You can still use the GM Racing knuckles for those earlier years

    4. Every other part should be completely compatible. For instance, you don't have to use FE1 struts if you want to put on FE5 springs, and so forth.

    Delta Brake Torque Specs
    Brake Caliper Bleeder Valve - Front With RPO LNF
    14 N·m
    124 lb in

    Brake Caliper Bleeder Valve - Front Without RPO LNF
    11 N·m
    97 lb in

    Brake Caliper Bleeder Valve - Rear
    11 N·m
    97 lb in

    Brake Caliper Bolt - With RPO LNF
    130 N·m
    96 lb ft

    Brake Caliper Bracket Bolt
    115 N·m
    85 lb ft

    Brake Caliper Guide Pin Bolt
    34 N·m
    25 lb ft

    Brake Hose Fitting Bolt - Front With RPO LNF
    40 N·m
    30 lb ft

    Brake Hose Fitting Bolt - Front Without RPO LNF
    48 N·m
    35 lb ft

    Brake Hose Fitting Bolt - Rear
    48 N·m
    35 lb ft

    I put red loctite(272, etc) on all of these bolts except the bleeder screw and the bolts/banjo bolt for the brake hose. Overkill? yeah. But brakes falling off sucks

    FE1 Part Numbers
    Sway bar: 15822933(18mm not 19)
    Bar clamps: 22608428(FE3 same)
    Bar insulators: 15821022
    Rear Axle: 15232753
    Bar Links: 15782690(same as FE3)
    Struts: 15876215/15876216(L/R, same as FE3)
    Shocks: 22696400
    Frt Springs: various, L/R diff.(not used by other RPOs)
    Rr Springs: 22705489
    Lower control arms: multiple numbers, varies by year and equipment, steel, not used by other RPOs
    Knuckle: 22667248/22667249(L/R, same as all models except LNF/FE5

    FE3 Part numbers:
    Sway Bar: 15782964
    Clamps: 22608428(same as FE1)
    Insulators: 15820163
    Rear Axle: 15232752(Same as FE5)
    Links: 15782690(same as FE1)
    Struts: 15876215/15876216(L/R, same as FE1)
    Shocks: 10368516
    Frt Springs: various, L/r different, (not shared wirth other RPOs)
    Rr springs: 10390024(same as FE5)
    Lower control arms: 15787556/15787555( L/R, aluminum, NOT the same as FE5)
    Knuckle: 22667248/22667249(L/R same as all models except LNF)

    FE5 part numbers
    Sway bar: 15821093
    Clamps: 22608428('05 only , 1bolt/1slot) 10389617(2 bolt, ALL other FE5 including LNF)
    Insulators: 22700091('05 only) 15822993(06-07 only)
    Rear Axle: 15232752(same as FE3)
    Links: 20784688(ALL FE5 same, including LNF)
    Struts: 15247245/15247246(L/R)
    Shocks: 22728821
    Frt Springs: 21994335(L/R same)
    Rr springs: 10390024(same as FE3)
    Lower control arm: 15803766/15803767( L/R, right same as LNF)
    Knuckle: 22667248/22667249(same as all except LNF)

    LNF/FE5 Part numbers
    Sway bar: 15782696
    Clamps: 10389617(same as 06-07 FE5)
    Insulators: 25847760
    Rear Axle: 25864579
    Links: 20784688( ALL FE5 same)
    Struts: 19181044/19181043(L/R)
    Shocks: 25793745
    Frt Springs: 25833647(L/R same)
    Rr Springs: 25821162
    Lower control arm: 25930725/15803767( L/R, right same on ALL FE5)
    Knuckle: 25923942/25923941(L/R, unique to LNF)
    Last edited by a moderator: Apr 5, 2011
  2. cobalt123

    cobalt123 Platinum Member

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    Jul 18, 2009
    Tyler Texas
    nice, and leave it
  3. RedDead

    RedDead Full Access Member

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    Aug 17, 2010
    Princeton, West Virginia
    leave it lots of info!
  4. cobalt123

    cobalt123 Platinum Member

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    Jul 18, 2009
    Tyler Texas
    updated with part numbers and torque specs

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