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
J41
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
(LS/LT)
JM4
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)
JL9
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)
JL9/LNF
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
(SS/TC)
The Cars
These are just Cobalts. If anyone can fill me in on G5's, Ion's or HHR's, I'll add that.
2005
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)
2009
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)
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
J41
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
(LS/LT)
JM4
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)
JL9
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)
JL9/LNF
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
(SS/TC)
The Cars
These are just Cobalts. If anyone can fill me in on G5's, Ion's or HHR's, I'll add that.
2005
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)
2009
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:
