Originally Posted by ATS Junior

Do you know what your current code is? The rear spring options are very similar to one another but small things will be different such as ride height and small differences in weight capacity. IMHO I can't really tell much of a ride difference between some of the rear spring codes because they are so so close. The F code is pretty expensive. If you don't know your code I would suggesting going with either a B code or C code. Both are still a factory replacement option but the B code will be right around 300 lbs lighter per side (not much in terms of ride stiffness) and it will have a slightly lower arch. Many many customers of ours go with the C code because they are basically the same price as the B code and work a little better in my opinion. Do you know what front spring you have? That may help determine the best option for you so you can match the ride height a little better and not sit super high in the rear.

We will price match any spring from SD and our shipping rates are much better because we are actually charging you what UPS is charging us and not making money on people.

-Junior

Originally Posted by Dweber85rc

For the limited towing you do a set of airbags might be a better choice.

Originally Posted by tbwonder

Have contemplated this option as well.

Ultimately it would help level the load but offers nothing in terms of load capacity right?

The dramatic squat of these trucks under a load that while heavy is still under their eating makes me think it’s be better to up the load capability and not just level it….

​​​​​​…..but is my understanding on target?

Originally Posted by tbwonder

Have contemplated this option as well.

Ultimately it would help level the load but offers nothing in terms of load capacity right?

The dramatic squat of these trucks under a load that while heavy is still under their eating makes me think it’s be better to up the load capability and not just level it….

​​​​​​…..but is my understanding on target?

Originally Posted by WE3ZS

Im confused by your question about the bags. They do level the load by increasing capacity, they are an additional "air spring" that gets added to the stock leaf springs to increase load carrying capacity. If you are referring to the factory ratings, nothing you will ever do will change those. Just be sure to stay under what your axle, springs (with additional air springs), wheels and tires are rated for.

Originally Posted by tbwonder

Sorry I wasn't clearer.

The air bags from everything I gather both here and from the makers....don't increase load capacity at all...but they do offer (in the case of Load Lifters) 5,000 lbs of levelling capability. They can level a load of that rate and help keep it level...but they are beholden to the load capacity of the springs, axle GVWR etc....but they don't add load capacity per se.

The only thing ....again from my reading here that really elevates the load capacity is a change of springs and other components...of course in keeping with the vehicles overall GVWR.

In my case, I am towing a 32' TT...9500 lbs...which IS UNDER the vehicle rating...but is pretty close and really taxes the suspension. Air bags would help tremendously I think without question in levelling and tow quality.

That's where I was going.....but I can accept that I could still be wrong here

Originally Posted by pirate4x4_camo

If a new suspension isn't in the budget and your current springs are not sagged then for $200 consider a new set of the KYB Mono Max shocks.



I have provided links to all the parts you need and narrowed it down to 2 vendors for the Procomp 22210/22415 setup that will put your ride height at 27". ( 4" over stock)
this rides great on the highway and performs excellent off road and will clear 35's

this setup eliminates the rear block which reduces axle wrap and the need for a rear sway bar
plus it increases caster and corrects the driveline angle, this will make it track straight and true and completely eliminates wander. ( assuming the rest of your steering is in order )

Total cost $1074 complete

Front Procomp leaf springs 22210 $90 each

https://www.amazon.com/Explorer-Pro-.../dp/B000CNBQ12

Rear Procomp Leaf 22415 $106 each

https://www.amazon.com/Pro-Comp-2241.../dp/B001FBMKF6

Zone adjustable Track Bar $100

https://www.amazon.com/Zone-Offroad-.../dp/B0025ZMFJC

Bilsteins 5100 shocks

Front $180 pair

https://www.amazon.com/Bilstein-3318.../dp/B00DRYS0GW

Rear $156

https://www.amazon.com/Bilstein-33-2.../dp/B00IL8BN0E


Ubolts

Front $54

https://www.wfoconcepts.com/<acronym...ts/19732/16883

Rear 8’’Ubolts x 3.5” round $47

https://www.wfoconcepts.com/<acronym...ts/19732/16924

3’ Spring Plate rear $38 pair

https://www.wfoconcepts.com/<acronym...rd/16828/17035

Front 3’ wide 2* shim $35 pair

Rear 3” wide 2* shim $35 pair

https://www.wfoconcepts.com/cr/3-Inch-Axle-Shims/4384

Originally Posted by pirate4x4_camo

The Modded rear pack is a whole different scenario.

Oh and I don’t know if that pic was taken on a lift or jack stands but either way it was just meant to illustrate the gap. We know from the graph that the gap is 4.6” of travel at curb weight ride height.

Tom,
i would love a pic of your rear springs when you are fully loaded but it looks to me like with the additional 2 bottom leafs that your spring would have to go well past inverted to actually fully engage the pack to contribute it’s full spring rate.
for the most part it seems to me the way you have it configured so that the overload leaf is just a block.
( although there is some additional rate being added by the contact with the bottom Ex leaf.

Your main pack spring rate is very likely similar to the stock excursion since the top 4 springs from the F250 are the of similar dimensions to the Excursions then by adding the bottom 2 leafs from the Excursion it likely puts you right at the stock 410 pounds per inch but now with 7 inches of travel.

if you multiply the 7” of travel by a spring of 410 pounds per inch that would give a capacity of 2870 per spring or 5740 total which as you know exceeds the rear axles 5250 pound rating. We could calculate how much spring Your overload is contributing by measuring the amount of contact it makes with the very bottom Excursion leaf when fully compressed but what ever it will likely be a moot point since without it you are already well over the axles rating