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Old 11-12-2010, 03:53 PM
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spring code part numbers

sorry to start a new thread on this, but i have been searching for three days and am no closer than when i started to solving my problem. I have seen many of the code charts for the 99-04 superduty's but none seem to match what i have. My rear leaf spring was broken and I bought a used set of 4(front and back). The person i puchased these from had sold his truck and didn't have the spring numbers from the door. My original springs according to the door code are UA.

My original rear spring has a part number of RPN 0388 F81A BE. Is this an A code spring?

The used rear spring has a part number of RPN 3231 1C34CC. it is close to a b code part number i found but wasn't sure. Any idea's what it is? It has an overload spring as well, whereas my original springs did not.

My original front spring has a part number of 3c34aca RPN 3176. Is this a U code?

The used front spring has a part number of 2c34afa RPN 3261. An x spring maybe?

Now assuming that the front is a u and the rear an x, how much if any will the x code raise the front over the original u springs?

I have already installed the rear springs and it looks like have raised the rear aprox 3/4 of an inch. The truck already had a front eveling kit on the front when i bought it, but it still sits over 3" lower than the rear. sorry for such a long post, just trying to give you all the info i have.
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Old 11-12-2010, 03:54 PM
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Forgot to mention my truck is an early 99 ext cab long bed. The donor truck springs were from a 02 ext cab.
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Old 11-12-2010, 03:57 PM
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i havent been able to figure out the spring codes stamped on the leafs themselves.
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Old 11-13-2010, 12:25 PM
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Anyone have an x or b code on there door where they could check there part numbers against the ones that i have?
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Old 11-13-2010, 12:33 PM
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mine is VB code. ill go get my rear codes off the leafs here in a sec.
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Old 11-13-2010, 12:34 PM
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thanks alot, hopefully that give me alittle more info to go on.
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Old 11-13-2010, 12:46 PM
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RR
F81A BE RPN 2618

RL
F81A BE RPN 2618

FR
F81AA FD RPN 2518

FL
F81AA FD RPN 2478




i just realised that the front could be on mixmached leafs.

Last edited by Jarrod B; 11-13-2010 at 12:50 PM.
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Old 11-14-2010, 06:23 AM
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i'm wondering if the rpn number matters
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Old 11-15-2010, 08:50 AM
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Codes on springs...no complete list as their engenering #'s not part #'s or code #'s.

a 2004 F SuperDuty:

Rear Springs — F-Series
B — 3C34-5560-L
C — 3C34-5A975-D
D — 3C34-5A975-G
E — 3C34-5A975-K
J — 3C34-5A975-J
M — 3C34-5A975-E
N — 3C34-5A975-F
P — 3C34-5A975-C
S — 3C34-5A975-C

2003 manual
Front Springs — F-Series
B — F81A-5310-EA
C — F81A-5310-EA
D — F81A-5310-EA
E — F81A-5310-EA
F — F81A-5310-FA
G — F81A-5310-GA
H — F81A-5310-HA
I — F81A-5310-RA
J — F81A-5310-JA
K — F81A-5310-KA
R — 2C34-5310-AAB, 3,600 lb.
S — 2C34-5310-AAB, 4,000 lb.
T — 2C34-5310-ABB, 4,400 lb.
U — 2C34-5310-ACB, 4,800 lb.
V — 2C34-5310-ADB, 5,200 lb.
W — 2C34-5310-AEA, 5,600 lb.
X — 2C34-5310-AFA, 6,000 lb.
Y — 2C34-5310-VA
Z — 2C34-5310-WA

Front Springs — F-Series

B — F81A-5310-EA
C — F81A-5310-EA
D — F81A-5310-EA
E — F81A-5310-EA
F — F81A-5310-FA
G — F81A-5310-GA
H — F81A-5310-HA
I — F81A-5310-RA
J — F81A-5310-JA
K — F81A-5310-KA
R — 2C34-5310-AAB, 3,600 lb.
S — 2C34-5310-AAB, 4,000 lb.
T — 2C34-5310-ABB, 4,400 lb.
U — 2C34-5310-ACB, 4,800 lb.
V — 2C34-5310-ADB, 5,200 lb.
W — 2C34-5310-AEA, 5,600 lb.
X — 2C34-5310-AFA, 6,000 lb. 2C3Z5310AF
Y — 2C34-5310-VA
Z — 2C34-5310-WA
Front Springs — Excursion

B — YC35-5310-ABC
C — YC35-5310-ACC
D — YC35-5310-ADA
G — YC35-5310-GA
H — YC35-5310-HA
S — YC35-5310-SA
Rear Springs — F-Series

B — 1C34-5560-CB also 3C3Z-5560-CB
C — 1C35-5560-DB
D — YC35-5560-EA
M — YC35-5A975-AA
N — YC35-5A975-BA
S- 3C3Z-5560-CA one you should get for EX spring swaps.
Rear Springs — Excursion
V code fronts..2C3Z-5310-HA get for Ex spring swap.
A — YC35-5560-A

Rear SD 30mm bar.. F81Z-5A772-AA


2007 F-Super Duty 250-550 Workshop Manual
SECTION 100-01: Identification Codes
DESCRIPTION AND OPERATION
Identification Codes
Vehicle Certification (VC) Label
.
Springs
.
Springs codes are listed (on the VC label) as a 2-part code. The first character listed is for the front springs. The second code listed is for the rear springs. Auxiliary rear springs may also be listed.
.
Front Springs
.
AA — 5C34-5310-AMD, 7,000 lb
BB — 5C34-5310-ALD, 6,500 lb
CC — F81A-5310-AHD, 6,000 lb
DD — F81A-5310-AGD, 5,600 lb
EE — F81A-5310-EA, coil
FF — F81A-5310-FA, coil
GG — F81A-5310-GA, coil
HH — F81A-5310-HA, coil
II — F81A-5310-RA, coil
JJ — F81A-5310-SA, coil
KK — F81A-5310-TA, coil
TT — F81A-5310-AFD, 5,200 lb
VV — F81A-5310-AED, 4,800 lb
YY — F81A-5310-UA, coil
ZZ — 2C34-5310-WA, coil
.
Rear Springs
.
BB — 5A975, leaf
CC — 5A975, leaf
DD — 5A975, leaf
FF — 5560, leaf
HH — 5A975, leaf
JJ — 5A975, leaf
KK — 5A975, leaf
NN — 5A975, leaf
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  #10  
Old 11-15-2010, 04:28 PM
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i have this chart saved, and i have seen several of them. None of my numbers line up exactly with the list. Some of them are way off and some of them are close. I have looked at the 99 manual list as well, but no luck there either.
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