Posting here as the springs don't change much across years.

First, greetings to everyone that remembers my activity from years back. Had to shift focus is all.

Still driving the 2015, and at 153k, I'm replacing all the suspension and steering. OEM has mostly served me well, she just started darty last month. I couldn't find any gaps in the joints, but there is zero stiffness in all of it.

I found my use overworks the Bilstein B8's, they can get damn hot at times, and a recent job change has me driving an unsettled section of highway.

No, I do not want the expense of remote reservoir, Not a desert runner, I just use the truck as a truck. The B8's went 50k without complaint, I just want to reduce their workload a touch while getting the truck settled on our worse sections of failing infrastructure.

For reference, my 2015 is a 7000lb GVWR XLT with 1521lb of capacity. 1.79" lift in front, 1" in rear, Hellwig bars on both ends and LT-D's on 17" rims to better soak up the bull**** that we call roads.

Most of the front end is already here. I went one step up with oem front springs to bring it more in line with where I'd like the handling to be. My issue is with the rear springs. I've got the 1900lb leafs, and would like to raise that to 2000-2100, but it appears even aftermarket follows the oem rates, so my next step is the 2500 HDPP springs. Nope.

Any ideas? I already checked Deaver, Alcan, ARB. No, I don't want bags, bumps, or RAS, the springs need to be replaced for the next 150k regardless of any other options, and I'd prefer to resolve this without doubling the cost.

Much appreciated, this forum has always been the best source of problem solving these trucks!

 

What about the max tow leafs from the 2018-2020 truck? Didnt they increase the RAWR from 3800 lbs to 4050 lbs in 2018 when there was a bump in the GCWR from 17100 to 18400? that would probably be a nice middle ground between your leafs and the HDPP leafs.

Deaver can make custom leafs.You can call them and tell them what you want and they will make them to your specs.

 

Also…maybe icon leaf packs?

 

Looks like the Icons add $500 to the cost of OEM, while Deavers are cheaper than oem.

I'll see if I can find the actual ratings on the newer max tow springs, and the part numbers as well. Took me tablulating data across three forums get the correct numbers for the front springs, was also getting hits on the rear springs in the search, but no one has posted up numbers.

The easiest would be if anyone has max tow, post up their rear GAWR and spring code.

I would still like to find the actual spring rating, though, as it going to be north of 2025lb.

 

Found the deflection rate changes from 200 to 240lb/in. That's a bigger change than I'm getting in the front, 17% vs 5%.

Edit:

OOF.

Ran a calculation, using what I estimate to be a 2200lb rear end, I get a 2" lift after removing my 1" lift shackle.
Not certain I want the extra 1" if I leave the shackles out as the tailgate step is near my limit due to age.

 

Ok, I've found this, which purports to be 2015 rear ratings. Anyone got the 2+1 with a 4220 rating? 219 comes in just under an inch over stock, I should have about the same height when installed without the shackles.

If you have that 2+1 and a 4220 GAWR rear, I'd appreciate the numbers off your spring.

 

A higher rate does not necessarily mean a higher ride height.

You have to see how the arch measurement differs. Check the rock auto listing for springs, they have arch measurements in their listings.

You can't look at any F150 and determine what springs are in it by looking at ride height, they all look the same, because the arch height is lowered as the rate goes up.

You also can't compare new springs to old sagging springs.
Replacing what you have with the same thing may be all you need to do to gain a couple hundred more lbs capacity.
You can also have them re arched.

What is your goal? Appearance? Capacity?Handling?

 

How do you know the unloaded curvature of the spring is the same?

 

I'm going off Ford's published deflection rates, which builders need for setting vehicle height. If there is an arch that further modifies stance, that would be required to be provided in the build data charts.

New original springs would be better, but as i stated I'm overworking the B8's, which aren't flimsy shocks. With how I use the truck, I blew through the oem shocks in about 20k.Lits of fireroads and property trails will do that.

And we've got a particularly poorly constructed section of highway and a few merger ramps that literally try to toss you our of your seat that likely will never be fixed, only paved over.

i don't want this new daily drive to cut my B8 life in half, not interested in having to replace them every other year, and I want this set of springs to get to 300k without as much deterioration.

Stance was achieved years ago, I'm trying to match my current setting.

 

The gawr is 4050 lbs and the spring code is ttbb.