Leaf Springs
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After that I installed "X-Code" front springs from ATS (Auto and Truck Springs) and couldn't be happier. Haven't had any issues with them. I think they are the 43-818 spring that Walley Hunter is talking about. I bought everything as a package (springs, u-bolts, etc.) and was considerably less than going OEM.
Ford Trucks for Ford Truck Enthusiasts
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Do you want it to ride stiffer (it will)?
Do you want the front end to sit higher (it will)?
The differences in reports that you might read as far as how much the front end will raise as a result of adding X code springs are more than likely due to different wheelbases, cab lengths, bed lengths, and curb weights. A crew cab long bed has more bridge distance between front and rear axle, and has more doors, more sheet metal, more glass, more window motors, more seats etc. The increased leverage applied to the front axle, plus the increased weight, results in less of a front ride height change than installing X codes on a regular cab, or a super cab short bed. So in your case, the ride height difference will be less than what others may have reported, but you are still installing stiffer springs than the ones you currently have.
Differences in reports also can be traced to what people call "X" code springs. Many people buy aftermarket springs, wittingly or not, because they are cheaper, and because they are told that they are the same as stock springs by the aftermarket vendors who profit from assuring folks of what they want to hear. I have no experience with the most popular aftermarket spring sellers seen on the forums. Several decades ago, I was young and dumb (still dumb, but not so young) and went through several spring change iterations on my '79 Ford 4x4. By the late '80s I arrived at the conclusion that the stock springs were best, and that the OEM actually knew more than whatever I thought I knew from reading the advertisements of aftermarket spring vendors. I can't say for certain that the same is true today, but I certainly suspect as much.
Based on the image you posted, the AFA in the part number confirms that those are 6,000 lb rated OEM springs, the heaviest rated front leaf springs that Ford offered on this platform. IOW, the same front springs as Ford equipped F-550s with. Did the previous owner explain why he never installed them?
If you're as happy with the ride quality today as you were when you shelled out 28K for your pristine low mileage turn of the millenia time capsule, then I'd let those new springs sit in the garage. You will be able to sell them as new for at least 200 times more than what you could get for the springs you would be taking out. And when you remove the old springs, you will also remove whatever semblance of stock ride comfort that you currently enjoy, and replace it with a hay wagon ride that might make you question why you read the forums in the first place... only to come away copying what everyone else does to make their trucks gradually worse until they etch a sketch out of them into a new model (which they then leave untouched).
Ignore the difference in RPN numbers. They have no meaning relative to spring rating. The AFA is the key suffix that identifies the spring. I'd wrap them up in oil impregnated paper and put them away until the use of the truck changed so significantly as to actually benefit from using them... such as if adding a snow plow or a cab over camper or a front winch and cow catcher bumper etc. JMHO.
Whereas I mucked with the suspension of my previous truck, I etch a sketched out of that one and left my current truck alone for the last 20 years.














