Super Duty Front Spring Code and Capacity Chart
Cargo Master
Joined: Nov 2015
Posts: 3,420
Likes: 934
From: Fort Worth, TX
I'm glad I talked to Junior before pulling the plug on new springs. He had data on ride height and spring rates that SDtrucksprings only dreams about. The price was good and he even threw in new eye bolts.
What Junior said about spring capacities jibes with WE3ZS's chart on Ford spring info, specifically that the Xcodes are the heaviest spring Ford makes, and even though they specify a 6000lb capacity, they are actually 5200lbs. He couldn't explain how Ford came up with those numbers, but apparently there's an international institute that tests springs and develops the proper ratings. Maybe Junior can chime-in and correct me if I'm mis-remembering.
I also called a very old and respected front end shop in Fort Worth and they said that the 2600lb (per side) springs are the heaviest ones and that they always put them 6.0Ls because of the weight of the engines.
Anyway, I am very happy with the ride so far. I put Bistein 5100's on the front and it rides a bit on the stiff side like a truck should but still comfortable too. Now to deal with the rear springs and clunking rear shocks.
What Junior said about spring capacities jibes with WE3ZS's chart on Ford spring info, specifically that the Xcodes are the heaviest spring Ford makes, and even though they specify a 6000lb capacity, they are actually 5200lbs. He couldn't explain how Ford came up with those numbers, but apparently there's an international institute that tests springs and develops the proper ratings. Maybe Junior can chime-in and correct me if I'm mis-remembering.
I also called a very old and respected front end shop in Fort Worth and they said that the 2600lb (per side) springs are the heaviest ones and that they always put them 6.0Ls because of the weight of the engines.
Anyway, I am very happy with the ride so far. I put Bistein 5100's on the front and it rides a bit on the stiff side like a truck should but still comfortable too. Now to deal with the rear springs and clunking rear shocks.
Moderator
Joined: Jul 2010
Posts: 12,050
Likes: 1,549
From: Media PA
That means that you have V code front springs that are rated at 5200lbs and Y codes on the rear, unfortunately I'm not familiar with the Y code. What does your sticker say about your rear axles weight rating?
New User
Joined: Sep 2020
Posts: 7
Likes: 0
Hey Chris,
What are you trying to accomplish? Height, weight capacity or both for the front of the vehicle?
I've been down this road before with this question and we supply a lot of guys on here with new replacement springs for the front and rear on their Ex's
Let me know if you need help with what exactly you want, I'd be more then happy to set you up with some pricing.
What are you trying to accomplish? Height, weight capacity or both for the front of the vehicle?
I've been down this road before with this question and we supply a lot of guys on here with new replacement springs for the front and rear on their Ex's
Let me know if you need help with what exactly you want, I'd be more then happy to set you up with some pricing.
With the RSK I'm looking mostly to improve ride with minimal lift. I do not want to reduce my GAWR because this truck will be used for towing and hauling.
Your site lists V codes as having only 2230lb capacity per side. Looks like Ford rated their V codes for 2600 per side by everything I've read on FTE. Other spring codes also look to be de-rated VS ford spec.
Just looking to understand which numbers I should go off. If I buy V codes from ATS will they have a 2600# rating or a 2230#?
Lastly, should I expect any extra lift with the V code springs over U code SD springs which are more closely rated to my stock T code OBS springs?
Appreciate any advice you can offer.
-Joe
New User
Joined: Sep 2020
Posts: 7
Likes: 0
Hey Chris,
What are you trying to accomplish? Height, weight capacity or both for the front of the vehicle?
I've been down this road before with this question and we supply a lot of guys on here with new replacement springs for the front and rear on their Ex's
Let me know if you need help with what exactly you want, I'd be more then happy to set you up with some pricing.
What are you trying to accomplish? Height, weight capacity or both for the front of the vehicle?
I've been down this road before with this question and we supply a lot of guys on here with new replacement springs for the front and rear on their Ex's
Let me know if you need help with what exactly you want, I'd be more then happy to set you up with some pricing.
Reason I'm asking is I'm looking to put a RSK on my 96 F350 CCLB 4X4 7.3 . Currently it has T code front springs and a 4600lb front GAWR. I want minimal lift, just level it out, keeping the untouched would be ideal. So, I'm looking at U or V code SD springs but your site has me a bit turned around. I do not want to under-spring/derate my front end. Can you confirm your springs are factory replacement and should be rated the same as the corresponding factory coded spring?
Also, using the PMF RSK should I expect additional lift over the 2.25" if I go with V code springs?
Appreciate an help you can offer.
-Joe
Edit: Sorry for the duplicate post. Noob member and my first attempt at a post didn't show up immediately as it needed moderator approval. I didn't realize this until I had already submitted another.
Last edited by mejoek; Sep 9, 2020 at 09:22 PM. Reason: update tag
Moderator
Joined: Jul 2010
Posts: 12,050
Likes: 1,549
From: Media PA
Hey Junior. Your site lists V codes as only having a 2230# rating. That's quite a bit less than what I'm reading here on FTE, everyone says ford rated their V codes with a 2600# rating. Are your V codes a true factory replacement with the same rating as the stock ford units?
Reason I'm asking is I'm looking to put a RSK on my 96 F350 CCLB 4X4 7.3 . Currently it has T code front springs and a 4600lb front GAWR. I want minimal lift, just level it out, keeping the untouched would be ideal. So, I'm looking at U or V code SD springs but your site has me a bit turned around. I do not want to under-spring/derate my front end. Can you confirm your springs are factory replacement and should be rated the same as the corresponding factory coded spring?
Also, using the PMF RSK should I expect additional lift over the 2.25" if I go with V code springs?
Appreciate an help you can offer.
-Joe
Reason I'm asking is I'm looking to put a RSK on my 96 F350 CCLB 4X4 7.3 . Currently it has T code front springs and a 4600lb front GAWR. I want minimal lift, just level it out, keeping the untouched would be ideal. So, I'm looking at U or V code SD springs but your site has me a bit turned around. I do not want to under-spring/derate my front end. Can you confirm your springs are factory replacement and should be rated the same as the corresponding factory coded spring?
Also, using the PMF RSK should I expect additional lift over the 2.25" if I go with V code springs?
Appreciate an help you can offer.
-Joe
Joe, you can tag a fellow member, which sends them a PM with a link to the post you tagged them in, by using the @ symbol followed by their screen name. It shows up like this @ATS Junior
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Joined: Sep 2013
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From: Souderton
Thanks for the tag guys! I definitely would not have seen you guys commented without it.
All of our springs (regardless of the truck make) will be made to factory specifications. If you look throughout the industry basically everyone has the V codes listed as 2,230 lbs per side, as far as I have always been able to tell Ford is the only one in the industry that has higher numbers for some reason. Why that is I have no idea... I have spoke to many people in regards to this and no one has an answer to why Ford has there number inflated a bit. We have had extremely good success with all our front tapered springs and they work just as if you received ones from Ford.
If you like to give me a call I would be more than happy to help figure out what set will work the best for you.
All of our springs (regardless of the truck make) will be made to factory specifications. If you look throughout the industry basically everyone has the V codes listed as 2,230 lbs per side, as far as I have always been able to tell Ford is the only one in the industry that has higher numbers for some reason. Why that is I have no idea... I have spoke to many people in regards to this and no one has an answer to why Ford has there number inflated a bit. We have had extremely good success with all our front tapered springs and they work just as if you received ones from Ford.
If you like to give me a call I would be more than happy to help figure out what set will work the best for you.
New User
Joined: Apr 2021
Posts: 8
Likes: 0
@ATS Junior I'm a new member of FTE so I cannot private message anyone as of yet but I would like to talk with you regarding my current situation with my front end rebuild on my 03' F350 CCSB SRW 7.3 as in springs if that would be ok?
Would you be available at ATS Springs on Monday if I were to call and ask for you? And thank you FTE for allowing me to be a part of the community..............................
Would you be available at ATS Springs on Monday if I were to call and ask for you? And thank you FTE for allowing me to be a part of the community..............................
Last edited by Badazzpred; Apr 3, 2021 at 12:11 AM. Reason: update
1st Gear
Joined: Aug 2022
Posts: 1
Likes: 0
Hey Chris, The whole issue with the SDtrucksprings vs OEM ratings centers around what SD..... had decided to call their replacement springs vs what Ford has established as their spring code rating system, they just aren't the same. As stated in the threads that you linked to SD..... uses the same part number (calling it an "X code") for several applications where the various different Ford codes were originally used. And the advertised rating for those springs is more in line with what Ford's rating was for their V codes. Pretty confusing for sure! Now from reading the post swap measurement from members who have used those aftermarket springs it sounds like they were getting more ride height improvement than what would have been expected from Ford's actual V codes, so the plot thickens.
I did a complete spring swap on my EX and decided for the money being spent (in the end I got very lucky with that!) and how important it was to me to get exactly what I was planning from the swap that only OEM springs would do for me. The misleading and apparently incorrect ratings listed on SD.....'s website left too much in question for me as to what exactly I should expect from their springs. I was extremely fortunate to have a set of X/B OEM take-off springs gifted to me by a co-worker and those springs (with my mods) delivered exactly the amount of ride height increase and performance that I planned for and expected based on the OEM specs.
And for what it's worth I have collected spring info from several sources over time but mostly from members here and my info shows some different ratings than what was provided in the earlier posts in this thread.
This is what I have collected on Ford's front leaf spring codes:
S codes = 4000lbs capacity, 370 inch/lbs, 4.34" travel.
B codes = 4100lbs capacity, 330 inch/lbs, 5.02" travel.
C codes = 4300lbs capacity, 350 inch/lbs, 5.01" travel.
T codes = 4400lbs capacity, 390 inch/lbs, 4.63" travel.
D codes = 4700lbs capacity, 380 inch/lbs, 5.14" travel.
U codes = 4800lbs capacity, 410 inch/lbs, 4.89" travel.
V codes = 5200lbs capacity, 430 inch/lbs, 5.13" travel.
W codes = 5600lbs capacity, 450 inch/lbs, 5.34" travel.
X codes = 6000lbs capacity, 470 inch/lbs, 5.54" travel.
Capacity is per set.
I did a complete spring swap on my EX and decided for the money being spent (in the end I got very lucky with that!) and how important it was to me to get exactly what I was planning from the swap that only OEM springs would do for me. The misleading and apparently incorrect ratings listed on SD.....'s website left too much in question for me as to what exactly I should expect from their springs. I was extremely fortunate to have a set of X/B OEM take-off springs gifted to me by a co-worker and those springs (with my mods) delivered exactly the amount of ride height increase and performance that I planned for and expected based on the OEM specs.
And for what it's worth I have collected spring info from several sources over time but mostly from members here and my info shows some different ratings than what was provided in the earlier posts in this thread.
This is what I have collected on Ford's front leaf spring codes:
S codes = 4000lbs capacity, 370 inch/lbs, 4.34" travel.
B codes = 4100lbs capacity, 330 inch/lbs, 5.02" travel.
C codes = 4300lbs capacity, 350 inch/lbs, 5.01" travel.
T codes = 4400lbs capacity, 390 inch/lbs, 4.63" travel.
D codes = 4700lbs capacity, 380 inch/lbs, 5.14" travel.
U codes = 4800lbs capacity, 410 inch/lbs, 4.89" travel.
V codes = 5200lbs capacity, 430 inch/lbs, 5.13" travel.
W codes = 5600lbs capacity, 450 inch/lbs, 5.34" travel.
X codes = 6000lbs capacity, 470 inch/lbs, 5.54" travel.
Capacity is per set.
is the SPR = ZC ULN MY SPRING CODE?
Moderator
Joined: Jul 2010
Posts: 12,050
Likes: 1,549
From: Media PA
Yes, SPR is your spring code. It says that your truck has Z code front springs and C code rears. I’m assuming that your ride is an ‘05+, the chart that you quoted is for the older front leaf springs, the newer coil front springs are a whole different range of options.