The "impossible" rear spring code decipher ?
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Fleet Mechanic
Joined: Dec 2005
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The "impossible" rear spring code decipher ?
So I am helping a friend with getting front and rear springs for a v/b code upgrade.
We have been able to get some almost brand new v-codes for the fronts and have come across rear springs but don't know what their spring code is from the numbers.
I know we could look at the label on the donor truck but that is no longer available.
They are from a 2004 F250
Here is a pic - we were hoping someone had the same numbers to help verify the spring code.
I know its almost an impossible task but hoping to get lucky and someone has the same numbers to verify.
We have been able to get some almost brand new v-codes for the fronts and have come across rear springs but don't know what their spring code is from the numbers.
I know we could look at the label on the donor truck but that is no longer available.
They are from a 2004 F250
Here is a pic - we were hoping someone had the same numbers to help verify the spring code.
I know its almost an impossible task but hoping to get lucky and someone has the same numbers to verify.
Junior User
Joined: Jan 2013
Posts: 73
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From: Issaquah Washington
I think that those are C codes? In the Superduty tech folder they do have some information on deciphering which is which. B-Code part number is 3C3Z-5560-CB
I am going through the same process trying to find a set myself!
I am going through the same process trying to find a set myself!
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Fleet Mechanic
Joined: Dec 2005
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3C3Z-5560-CB is the part number used to order b-codes but it is not necessarily the part number that is stamped onto the springs when pulled from a loaner truck.
I have the feeling that they are c-codes which wouldn't be too bad but if they are something less than a b-code we would be pretty bummed.
Here is a listing of part number and the only one that is similar lists an S and it doesn't have the extra C at the end.
RPN 2483 3C34 CC
2004 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
Tim M
I have the feeling that they are c-codes which wouldn't be too bad but if they are something less than a b-code we would be pretty bummed.
Here is a listing of part number and the only one that is similar lists an S and it doesn't have the extra C at the end.
RPN 2483 3C34 CC
2004 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
Tim M
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Joined: Nov 2012
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From: SoCal
Those look like B codes with the auxilary spring on top.
If you remove the auxilary spring and block, you will have standard B code rear springs.
You might need to get new, shorter center pins from a spring shop or other seller if you run out of threaded area once the aux spring and block are removed.
Otherwise, you should be good to go.
What's the engineering number painted on the bottoms, if still visible?
Ford also makes an F code with aux spring that look similar, but they are beefier looking than what you have there. The F codes would likely have 6C34-5A975-DA painted on them, which translates to Ford part # 6C3Z-5560-D. If they measure about 4 3/8 inches in the center, they are F codes. If less, they are most likely B codes.
FWIW, you can still remove the aux spring and block and use them on your Ex if they are F codes.
If you remove the auxilary spring and block, you will have standard B code rear springs.
You might need to get new, shorter center pins from a spring shop or other seller if you run out of threaded area once the aux spring and block are removed.
Otherwise, you should be good to go.
What's the engineering number painted on the bottoms, if still visible?
Ford also makes an F code with aux spring that look similar, but they are beefier looking than what you have there. The F codes would likely have 6C34-5A975-DA painted on them, which translates to Ford part # 6C3Z-5560-D. If they measure about 4 3/8 inches in the center, they are F codes. If less, they are most likely B codes.
FWIW, you can still remove the aux spring and block and use them on your Ex if they are F codes.
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Fleet Mechanic
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I wish there was some way to be sure. I know some use the c-codes but I just came across a thread that said this.
I've read there are two different C codes. You want the ones from the dually rigs, not from the SRW rigs.
The set we are looking to get have low mileage and are a good price but they would be from a SRW 2004.
The part number from the springs are RPN 2483 3C34 CC
Tim M
I've read there are two different C codes. You want the ones from the dually rigs, not from the SRW rigs.
The set we are looking to get have low mileage and are a good price but they would be from a SRW 2004.
The part number from the springs are RPN 2483 3C34 CC
Tim M
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Fleet Mechanic
Joined: Dec 2005
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I guess one question I should ask is did they put c-code springs on an F250 in 2004 or any F250 for any year.
You would think since the c-code spring were the highest rated spring in 2004, it would be for the higher capacity 1 ton F350 only.
Tim M
You would think since the c-code spring were the highest rated spring in 2004, it would be for the higher capacity 1 ton F350 only.
Tim M
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Fleet Mechanic
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Do you think I could get the spring code if I got the VIN Number from the owner. He must have a copy of it somewhere. I should then be able to ask for a replacement spring from Tousley and perhaps they could tell me what spring it was suppose to have on it.
Any thoughts?
Tim M
Any thoughts?
Tim M
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Fleet Mechanic
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Ok, I have been thinking about the question and perhaps as mentioned earlier ....instead of trying to find out what they are can we determine what they are not.
The possibilities are ??
1. A-code springs
2. B-code springs
3. C-code springs
4. ?-code springs
Questions...
1. Did A-code springs from an F250 in 2004 come with the top overload leaf that is in the picture?
2. Did an F250 in 2004 come with a C-code spring?
Any help would be appreciated.
Tim M
The possibilities are ??
1. A-code springs
2. B-code springs
3. C-code springs
4. ?-code springs
Questions...
1. Did A-code springs from an F250 in 2004 come with the top overload leaf that is in the picture?
2. Did an F250 in 2004 come with a C-code spring?
Any help would be appreciated.
Tim M
Freshman User
Joined: Aug 2015
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Were you ever able to figure out what springs they were. I just ran into the exact pair and was wondering if they ended up being Bs or Cs or Other...I know this thread is probably dead but it is worth a shot to save a little cash.
Elder User
Joined: Nov 2004
Posts: 614
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From: Fort Wayne IN
What's the number off the spring? The picture won't open anymore. Or, if you can give me the last 8 of the vin # of the truck they came off I can tell what they are.
Freshman User
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