2010 screw 6.5' box 5.4l max tow 4x4

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Into physics much?? But your theory here does sound plausible...

 

The confusion about the chart posted by pfbz is because Ford expresses spring rates (and other items) through GAWR (Gross Axle Weight Rating). That is, Ford shows the axle carrying result of the spring rate (and other items), not the spring rate itself. This makes comparison easier, because a) it defines things in a meaningful way and b) it allows comparisons across suspension geometries (spring rate isn't really what you want to know; you want wheel rate, but that depends on both spring rate and suspension design).

 

Makes sense. Though while easier to compare Ford springs, it makes it much more difficult to look at changing the front spring rates using easily available coils from a company like Eibach or Moog.

 

VVGG
2011 157inch WB 4X4 EB with 7700 Maxtow package

 

Indeed. Ford naturally uses a system that might appeal more to buyers of new Ford trucks. I would add that Ford makes info like this difficult to find, and acts like Max Tow doesn't exist. So, Ford is hardly consumer-friendly on information (for reasons I find inscrutable) for new truck buyers.

Aftermarket companies, as you say, have a different task. Ideally, they would quote spring rate as a percentage of stock (OEM) rate (120%, 150% etc) and name the reference spring or springs. This would obviate the need to dig up OEM spring rates which on some vehicles (not just Ford) are close to impossible to find. I find that they too do a poor job of conveying information, often preferring to make their products seem to be the product of magic.

 

So by using the chart on the first page and getting your curb weight for the front and back, you can use that to determine how much weight you should add to your bed for traction in the winter?

For example I have a 2011 Supercab 3.7L 4x4 145wb for 31** lbs front and 22** rear curb weight. I would add about 700-800 lbs to even up my front and back curb weight?

I know many of you don't deal with heavy snow or the winters we have up here in Canada but this could be a nice-to-know number. I only added 350 lbs this year and noticed the rear slide out a fair amount.

 

Anyone ever figure this out what the codes mean? By the way mine is UUGG for a 2013 F150 SCAB 4x4 145" Max tow. Also here is the 2013 chart. https://www.fleet.ford.com/truckbbas...F-150_v1-1.pdf