Spring rates

[PGSigns]

Lots of discussion on what drop springs will get folks to the level they want but with all the various combos of trucks from 63 to 72 from long bed to short bed to burb the rear weights are all over the map. Then ad moving the fuel tank to the back and other mods a 2" spring in one truck could result in 3" in another. Could we build a list of springs from the suppliers that have been checked for the rate? I have a local circle track racer with a spring checker and will check what I have here and when I get stuff. If you have checked any or have information about ones that have been checked please ad the information. I think will help the burb guys also giving an idea of what will work using truck springs.
Thoughts?
Jimmy

[PGSigns]

This is for both front and rear springs.
Jimmy

[VictoriaHardware]

What, an attempt to actually engineer rather than use trial-and-error? What a concept. I tried the same thing and in short I still had to repeatedly change springs before I was happy with the whole setup. The problem is that what is sold on the aftermarket is not what you expect (sound familiar?). The larger variable is the truck you are working on.

I called several suppliers and they knew ONLY what was posted in thier catalog. When asked about spring rates, free length, coil diameter, etc. they did not know and were unwilling to find out. It was clear they were just selling someone else's product. Customer service was not in their business plan. The exception to this was Eaton Detroit Spring, who manufactures their own springs. Here is some data I compiled. As you say, maybe others can add more data from first-hand experience.

The truck you are working on is invariably different from everyone else's. There are so many variables that factor into ride height- wheelbase, body style, engine/trans, aftermarket modifications, 1/2 or 3/4 ton, mileage, usage (or rather abusive usage), etc. Wheel/tire combination is another world.

So as stated earlier, this "engineering data" got me started. Before it was perfect I still had to do some trial and error with before/after measurements before I was done.

[PGSigns]

Very good info. That's the kind of information I would like to see posted. I have a couple of Springs to check once all this snow and ice goes away. This info would make it much easier to help folks with lowering plans and issues.
Jimmy

[PGSigns]

Got this info from Beltech today. Got a Burb coming and trying to plan for the drop. Ads a good bit to the list.
Jimmy
Thank you for contacting Belltech. The requested information for the 65 C-10 is listed below

Front springs
#4700
Rate 1100 lbs/in
Free length 12.11"

#4702
Rate 1100 lbs/in
Free length 11.61"

Rear springs
#5352
Rate 260 lbs/in
Free length 12.01"

#5353
Rate 260 lbs/in
Free length 11.01"

#5355
Rate 260 lbs/in
Free length 9.01"

[PGSigns]

Got some info from Eibach today. There C10 3 and 4 inch drop rear springs are 257 pounds per inch.
Jimmy