Modded C code spring?
FTE Chapter Leader
Joined: Nov 2010
Posts: 30,587
Likes: 1,234
From: N. IL
See this thread: Rob covered some of the questions being asked here.
https://www.ford-trucks.com/forums/1...y-options.html
https://www.ford-trucks.com/forums/1...y-options.html
There are two versions of Cs, SRW and DRW. I have SRW and like them very much. Rate wise a SRW C and a B are very close, the difference is that the SRW C has a later engagement of the secondary rate. However, the first rate rolls into the secondary so the perceived benefits might negotiable. I've said it a few times before that if you're replacing worn factory springs with used Super duty springs, then anything is an upgrade. If you're buying new from Ford, then study the rates to your hearts content!
B 320/670, transitions at ~1650 lbs
SRW C 330/650, transitions at ~1800 lbs
DRW C 350/730, transitions at ~1800 lbs
From Ford the cheapest new spring is the B spring, at least when I did my swap.
With my new from Ford SRW C's, I have a slight rake with new V's up front and that's using the stock Excursion block.
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B 320/670, transitions at ~1650 lbs
SRW C 330/650, transitions at ~1800 lbs
DRW C 350/730, transitions at ~1800 lbs
From Ford the cheapest new spring is the B spring, at least when I did my swap.
With my new from Ford SRW C's, I have a slight rake with new V's up front and that's using the stock Excursion block.
.
Laughing Gas
Joined: Jul 2010
Posts: 1,174
Likes: 2
From: Flat Rock, MI
^thanks Sean! It's difficult to say what lift you'll get from any spring because nobody knows how worn your current springs are. I believe V's in front with mod B's in back net a rake similar to factory (someone correct me if I'm wrong). If so, my "as delivered" from Ford SRW C codes with the stock block net a similar factory rake if not slightly more. To make it more confusing there is a 20 mm variance on the springs so that coupled with your current ride height and if your using used springs = difficult to predict the gain. The only certainty is that any spring you put on should be a big improvement.
Senior User
Joined: Dec 2014
Posts: 254
Likes: 0
From: Miami, Fl
So can I run V front and mod C in rear and not have too much rake or would I need to add a leaf to the front? I currently have brand new Ford V springs and was debating if I should get ATS modified C code for the back or sell the V codes and do X/C
Laughing Gas
Joined: Jul 2010
Posts: 1,174
Likes: 2
From: Flat Rock, MI
You don't need to mod the C codes if they are SRW. If you run ATS I'm not sure what you'll get for ride height, seems most but front and rear from them and are happy.
Senior User
Joined: Feb 2015
Posts: 427
Likes: 5
From: Central Pennsylvania
Call Junior at ATS and have a quick conversation with him as to what you are doing. He will help you out.
Cargo Master
Joined: Mar 2011
Posts: 2,066
Likes: 4
From: North Texas
Junior will help set you straight. I have the modified C codes from them in the rear and their x codes up front. It is level. You may need a new adjustable trac bar up front as well. I sure need one as my springs are pulled over to the sides of the spring pockets up front. Night and day difference in ride and so much better when towing heavy. Best thing I have done to the Ex
Posting Guru
Joined: Dec 2012
Posts: 1,644
Likes: 3
From: SW Ohio
ATS X/C mods and love'em! LOVE'EM! LOVE'M!
The rake front to rear is about 3 inches. Looks like an old muscle car stance!
Junior has a nice package.....setup that is! Front/Rear springs and new hardware at an awesome price.
Ride is night and day difference! Towing with is to!
Junior explains the spring rate and how the 1st/2nd rate works so us non-spring minded folks can understand it!
The rake front to rear is about 3 inches. Looks like an old muscle car stance!
Junior has a nice package.....setup that is! Front/Rear springs and new hardware at an awesome price.
Ride is night and day difference! Towing with is to!
Junior explains the spring rate and how the 1st/2nd rate works so us non-spring minded folks can understand it!
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Mountain Pass
Joined: Jun 2005
Posts: 249
Likes: 2
From: California
For those running X codes in the front and Modded Cs in the rear, how satisfied are you with your setup? Is the ride harsh or smooth? I have been speaking with Junior from ATS about this and this is one option he gave me. I don't tow much and mainly use it for the family so I wanted something stable, firm yet comfortable as a truck can be. I do plan in the future to add a replacement front bumper or a winch so the added weight up front is something to keep in mind. Below I'll list the three options ATSJunior gave me. If you were in my shoes which would you go with and why?
Option 1: V/C code swap
Option 2: X code up front and ATS modded C in the rear
Option 3: X code up front & replacement C code in the rear WITH a taller block
Option 1: V/C code swap
Option 2: X code up front and ATS modded C in the rear
Option 3: X code up front & replacement C code in the rear WITH a taller block
Moderator
Joined: Jul 2010
Posts: 12,049
Likes: 1,546
From: Media PA
Ruben, if you plan to go with a front winch at some point along with a heavier bumper then you will want the X codes for the front. They were the springs used on snow plow prepped Super Duty trucks to support the added weight of the plows, your winch and bumper along with the PSD may be a bit much for V codes.
Mountain Pass
Joined: Jun 2005
Posts: 249
Likes: 2
From: California
Ruben, if you plan to go with a front winch at some point along with a heavier bumper then you will want the X codes for the front. They were the springs used on snow plow prepped Super Duty trucks to support the added weight of the plows, your winch and bumper along with the PSD may be a bit much for V codes.
Moderator
Joined: Jul 2010
Posts: 12,049
Likes: 1,546
From: Media PA
My X/Bs were a free gift from a coworker. He had removed them with 20k miles when he lifted his pickup and they were still sitting in his garage. He was very happy to get rid of them to get the space back, he even delivered them to my house! I have about $70 invested in my spring swap, new U bolts and 4 new center bolts. 
My setup does have a pretty firm ride but that was what I wanted. Our Ex is now a dedicated tow rig for the most part and with the heavy TT in tow the ride is pretty good.
My setup does have a pretty firm ride but that was what I wanted. Our Ex is now a dedicated tow rig for the most part and with the heavy TT in tow the ride is pretty good.
Cargo Master
Joined: Mar 2011
Posts: 2,066
Likes: 4
From: North Texas
I like the firmer ride that is less sloppy than the factory setup. If I were never going to tow I would not have went with the modded C for the rear though. V/B is great for people hauling from what I can read.
, this is a difficult decision 
. I do appreciate the feedback though.