Has anyone installed the F250/F350 Super duty 3000 pound leaf springs on a 2003 4x4 Excursion , it has the V10 in it. I want to make sure it's an exact swap. I pull an 8000 to 10000 pound travel trailer and the tongue weight too much on the stock springs, and I am using a weight distributing hitch. I'm going to put heavy duty shocks like Rancho 9000s and new 10 ply tires on too. It looks like their the same from 1999 to 2003, and possibly newer.

 

Go here https://www.ford-trucks.com/forums/1...ch-folder.html

Scroll down to Suspension, Spring Modifications, Shackles and have fun reading...

To add to that, I have some and I am going to do what they call the B-code mod for the rears...

-Art

 

Search for b code spring swap. They bolt on basically, though they are a little different with the overloads and all.

 

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You will also need to do the fronts as well Truck springs will give you a 2" + lift

 

Welcome to the best place on the web for info and advice about the mighty EX!

Yes, swapping in the heavier duty rear springs (with the above mentioned mods) and adding a rear sway bar are some of the best things you can do to improve the EX's heavy towing abilities. And as was also mentioned swapping the front springs along with the rears will not only help to keep the EX level but it will greatly improve the ride as they will get your front end up away from the bump stops.
I run modded F-350 springs front and rear on my EX that serves primarily as our tow rig for our 41' 11,000 travel trailer and the improvements in handling from the swap are amazing!

 

Thank you everyone for the replys. I have been looking at the 'B' spring swap. I probably need longer U-bolts too. I was also looking at airbags, just not sure about those. I'm thinking the leaf springs would be the best.

 

Why change out the current leaf springs when you can go to a truck spring shop and get them to add a leaf spring to your existing set?
I did that on an older truck i used to have and tow trucks for example do that all the time......

 

Another option is to add the Roadmaster Active Suspension. Easier install and cheaper than new springs. The end result is the same; a stiffer ride.

 

My new c code springs do not feel much stiffer at all when unloaded...load it down though and its perfect. Nothing you do to a factory spring will fix the axle wrap issue and a super stiff leaf added in there will probably get you a stiff ride.

 

I'm still running on the factory springs, but have air lift 1000 air bags ( they attach to the top of the spring just in front of the axle. Between those and a rear seat bar my X tows my 9200 lb TT just fine, I also have 1200 lbs of tongue weight.

 

Mike the crappy stock EX rear springs are a single rate mess of wrap happy leaves, so much so that Ford even put a slapper traction bar on the 4X4 EX to help control them. They are a 430lbs per inch rated pack.
The SuperDuty B codes rears are a dual rate spring pack starting at 320lbs per inch and transitioning to 670lbs per inch at 3300lbs, the total B code pack is rated at 5990lbs. Due to the dual rate spring pack the B codes actually ride better unloaded than the stockers and they handle higher loads much better than the EX springs. And due to differences in their construction the B codes are far less likely to wrap up under high load situations.
SD rear C codes are very similar to the B codes with a dual rate of 330lbs per inch and transition to 650lbs per inch at 3562lbs with a total spring pack rated at 5590lbs. The DRW C codes are rated at 350/730lbs per inch.
Adding a stiffer leaf to the stock EX pack will not deliver the same type of ride and load handling improvements that swapping to dual rate SD springs will.

 

I tried adding a leaf on the front and RAS on the rear. I eventually changed the springs. The new springs are a better option than just trying to cover up the problem.


In my case the additional front leaf kept it from bottoming out but even with the RAS very tight while it kept the rear from bottoming there was still noticeable sag and the ride was overly light.


The heavier springs did make a stiffer ride on a smooth road but on rougher roads and when towing they are a noticeable improvement.