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Spring rate codes?

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Old 07-07-2011, 09:27 PM   #1
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Default Spring rate codes?

I'm curious about the variation of springs on 2011 F150's.

I have a 2011 FX4 SuperCrew EcoBoost 145".

Here's my door sticker:


So I think UUAA are the spring codes, with UU as the front spring codes and AA as the rear.

Anybody able to decode these into actual spring rates?

Anybody with a similar, but slightly different truck that wants to share their spring codes?
  • Same truck, not FX4.
  • Similar truck, but 5.0 or 6.2L.
  • Similar truck, but 154" wheelbase.

One of the reasons I'm curious is I'm looking at the Rancho Quicklift loaded system. It comes with new springs, but the same springs no matter what configuration F150 you have. I wonder if these springs are stiffer or softer, and how much variation there is just from Ford on spring rates.

Last edited by pfbz; 07-07-2011 at 09:49 PM.
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Old 07-07-2011, 09:51 PM   #2
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Interesting.
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Old 07-07-2011, 11:03 PM   #3
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Fronts are 5310 lbs, rears are 5560 lbs.
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Old 07-07-2011, 11:24 PM   #4
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My truck has VVGG under spring. How much is that?

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Old 07-07-2011, 11:46 PM   #5
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Quote:
Originally Posted by Fordrocks39 View Post
My truck has VVGG under spring. How much is that?

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Saem. V implies an Econoline front spring/torsion bar. Odd...

Front Springs


1 5B326 (RH), 5B327 (LH) torsion bar (F-150, F-250, Explorer/Mountaineer)
2 5B326 (RH), 5B327 (LH) torsion bar (F-150, F-250, Explorer/Mountaineer)
3 5B326 (RH), 5B327 (LH) torsion bar (F-150, F-250)
4 5B326 (RH), 5B327 (LH) torsion bar (F-150, F-250)
G 5B326 (RH), 5B327 (LH) torsion bar (F-150, F-250)
8 5B326 (RH), 5B327 (LH) torsion bar (F-150, F-250)
9 5B326 (RH), 5B327 (LH) torsion bar (F-150, F-250)
Z 5B326 (RH), 5B327 (LH) torsion bar (F-150, F-250)
T 5B326 (RH), 5B327 (LH) torsion bar (F-150, F-250)
U 5B326 (RH), 5B327 (LH) torsion bar (F-150, F-250)
6 5B326 (RH), 5B327 (LH) torsion bar (F-150, F-250)
C 5B326 (RH), 5B327 (LH) torsion bar (F-150, F-250)
E 5B326 (RH), 5B327 (LH) torsion bar (F-150, F-250)
F 5B326 (RH), 5B327 (LH) torsion bar (F-150, F-250)
B 5B326 (RH), 5B327 (LH) torsion bar (Explorer/Mountaineer)
D 5B326 (RH), 5B327 (LH) torsion bar (Explorer/Mountaineer)
E 5B326 (RH), 5B327 (LH) torsion bar (Explorer/Mountaineer)
F 5B326 (RH), 5B327 (LH) torsion bar (Explorer/Mountaineer)
G 5B326 (RH), 5B327 (LH) torsion bar (Explorer/Mountaineer)
H 5B326 (RH), 5B327 (LH) torsion bar (Explorer/Mountaineer)
J 5B326 (RH), 5B327 (LH) torsion bar (Explorer/Mountaineer)
L 5B326 (RH), 5B327 (LH) torsion bar (Explorer/Mountaineer)
P automatic ride contro(Explorer/Mountaineer)
A 5310 spring (Econoline, F-150, F-250, Ranger)
B 5310 spring (Econoline, F-150, F-250)
C 5310 spring (Econoline, Ranger)
D 5310 spring (Econoline, Ranger)
E 5310 spring (Econoline, Ranger)
F 5310 spring (Econoline, Ranger)
G 5310 spring (Econoline, Ranger)
H 5310 spring (Econoline, Ranger)
J 5310 spring (Econoline, F-150, F-250)
K 5310 spring (Econoline, F-150, F-250, Ranger)
L 5310 spring (Econoline, F-150, F-250)
M 5310 spring (Econoline, F-150, F-250, Ranger)
N 5310 spring (Econoline, F-150, F-250, Ranger)
P 5310 spring (Econoline, F-150, F-250)
R 5310 spring (Econoline, F-150, F-250)
S 5310 spring (Econoline, F-150, F-250)
T 5310 spring (Econoline, Ranger)
U 5310 spring (Econoline)
V 5310 spring (Econoline)
W 5310 spring (Ranger)
Z 5310 spring (Econoline) Rear Springs

6 5560 spring (Econoline)
7 5560 spring (Econoline)
C 5560 spring (Econoline, F-150, Ranger)
E 5560 spring (Ranger)
N 5560 spring (Econoline, F-150)
P 5560 spring (Econoline, F-150)
R 5560 spring (Econoline, Ranger)
S 5560 spring (Econoline, Ranger)
T 5560 spring (Ranger)
X 5560 spring (Ranger)
G 5560 spring (Econoline, F-150)
K 5560 spring (Econoline, F-150, Ranger)
A 5560 spring (F-150)
B 5560 spring (F-150)
D 5560 spring (F-150)
F 5560 spring (F-150, Explorer/Mountaineer)
H 5560 spring (F-150, Explorer/Mountaineer)
J 5560 spring (F-150)
L 5560 spring (F-150, Explorer/Mountaineer)
1 5560 spring (F-250)
2 5560 spring (F-250)
3 5560 spring (F-250, Ranger)
4 5560 spring (F-250)
X 5580 spring, load-leveling suspension (F-250)
Y 5580 spring, load-leveling suspension (F-250)
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Old 07-07-2011, 11:57 PM   #6
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Well it's not a van last time I checked. So that is weird

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Old 07-07-2011, 11:57 PM   #7
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OK, looking at the Ford Body Body Builders Layout Book it looks like they list the spring rates for all the different body/engine/wheelbase configurations.

It looks like there is less variation than I would have thought...
For example, 145" wheelbase (5.5' bed) 4x4 SuperCrews with the 3.5L, 5.0L, and even the 6.2L all use the same springs...
  • 3900 lbs front
  • 3850 lbs rear
Add the Max tow, the front stays the same, the rear goes to 4050 lbs.

You can check out all the spring rates below...



Last edited by pfbz; 07-08-2011 at 02:07 AM.
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Old 07-08-2011, 12:07 AM   #8
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Of course the other issue is that I'm used to seeing springs, especially coils, defined as lb/in, N/m, or kg/mm. The numbers listed above are way to high to be lb/in measurements...

I'd love to know how Ford's spring rates map onto more standard spring rate measurements, and how he letter codes map onto the spring rates shown above.

I've seen the chart posted by Platinum_Sean, I don't think it's accurate for our vehicles, and it doesn't seem like those numbers are spring rates, as ALL the fronts are 5310 and almost all the rears are 5560.

Last edited by pfbz; 07-08-2011 at 12:33 AM.
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Old 07-08-2011, 12:12 AM   #9
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Quote:
Originally Posted by Fordrocks39 View Post
My truck has VVGG under spring. How much is that?
What year, wheelbase, engine, drive, and cab configuration?
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Old 07-08-2011, 12:42 AM   #10
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OK, one more thought...

I've never seen springs measured in "Pound Force/Foot" but evidently they sometimes are, and it sure sounds like an American car thing to do

If it was in lb/ft, 3900 lb/ft would equal a somewhat plausible 325 lb/in or 5.8K kgf/m.

Yea, I know I'm over-thinking this...

Last edited by pfbz; 07-08-2011 at 04:00 AM.
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