I know that this has been discussed before, but i never found an answer to a question I have. Marv was very good in answering most of my questions.
I have a set of Ford 57" leaf springs with the 4 leaf pack with the poly sliders between the leaves, a flat helper spring and a angled block. The springs are 3"wide not the 2.5" that everyone has used. The springs are very flexy.
Questions
Has anyone used these springs before?
Does it matter weather or not they are 2.5" or 3" wide as long as it works with your application?
And last has anyone tried using the Rancho 2.5" lift springs RS44154? (they are very close in spring rate to the Chevy Rancho replacements)
Any help, advice or experience will be greatly appreciated,
Mike

try it and let us know hoe it works, sounds neat.

i belive the 3 inch wide ones use a centered center pin. where as the 2.5 inch ones (some years) use the 7 inch offset center pin

I have been looking for the same answers.Marvin answered most but didn't know the spring rates for these or if they were the same as the 2.5".Mine are out of a Bronco.Blazin:D

the 2.5 " and the 3" both have the same offset. flat measurement is 59.15" overall which is approx. 57 " arched. the offset flat is 25.50" forward and 33.65 to the rear for a total of 8.15". The Rancho 2.5" lift springs RS44154 are rated at 280lbs/in spring rate, 8.20" free arch, 2.05 front eye, 1.72 rear eye, 2.33 inch thickness in center. the kicker is that the Rancho's are 8 leaf packs. these are replacements for F250. there is no replacement foran F150. I have a set of 3" OEM springs i will try to measure them tonight.
thanks for the help and input.

Those sound slightly differnt than the F150 swprings that I am using. They also come in a 2.5" and 3" version. I chose to use the 3" version, in hopes that they would last a little bit longer. I'm runing them on the front of my '93 SAS toyota. They are very flexy and drive great. I chose to swap the second leaf with the procomp 2.5" add a leaf to stiffen up the spring rate slightly and give a little bit more arch to clear steering components.

I posted this a while back in the toy forum:

Ok, revised measurements taken today with weight sitting on the springs. I measured from spring eye to center pin, parallel to the ground and got:

-short side- 24.5"
-long side- 31.5"

These springs really sag when weight is put on them, the 19" measurement, I believe was taken with no weight on the springs. To a point, DRM is right, but he is splitting hairs, longer springs flex better period, the center pin will affect it some and probably a fair amount, if it really was 19". The F150's flex more than my 2.5" wranglers did and since they are 3' wide, I believe they will be a bit more durable, but we'll see as soon as the snow falls. I don't have a digi cam, or else I'd post pictures. My F150's max out my 9012's. I'm going to move them to the back in a / \ configuration and buy some of the new 9015's for the front. I am running 3 leaf chevy's in the rear with a buggy and laterally folding shackle.

Wilson, I saw your thread on your rig when you installed the F150 springs in the rear. Looks like they work well on your rig. thanks for the experience and comments. I have a friend running a F-150 extended cab with an International crew cab body on it. this thing is really cool. he added air bags fixed at one and a bucket on the other end. this allows for good flex offroad and added capacity when loaded down on the road.
thansk to all for input on this subject i got the answers i was looking for.
I will call Ford today and try to find out the stock spring rates.

The F150's are in the front, I'm running 63" Chevy's in the rear.