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Wow! What would make for all of these variables? I would think one spring rate would do the job for all FE3 applications out back!

You're welcome. GnatGoSplat here compiled that info and much more on the old site. If you crop that link down to http://www.w-body.com/oldsite/you may find more stuff that interests you.

the info you ask is impossible to know. I have seen a few variants of springs, and the most likely car to have stiffer springs will be a car that came with the heaviest powertrain options, and FE3 suspension. I'd say check 3.4 and 3800 cars at a junkyard. You will have to print that page out and go on a junkyard crawl.

FACT: there are NOT 4 springs. you have a monoleaf in the rear that serves both rear tires. FACT: FE1 and FE3 does not correlate to the actual spring code, just the relative firmness of the spring related to the vehicle. ie. you could be buying springs from a FE3 car that has softer springs than your FE1 car. YOU NEED TO RESEARCH WHAT YOUR SPRING CODES ARE AND WHAT THE DONOR CODES ARE to get desired results. EDUCATE YOURSELF. http://www.w-body.com/oldsite/spring-codes.html again... HAVE YOU PUT NEW STRUTS ON THE CAR AND FOLLOWED OTHER ADVICE GIVEN?

An improvement for sure, but many not be what you are looking for. Even FE3 front springs are kind of soft. For a more sportier ride you could cut a coil off of them or go front coilovers. Either way will work. You would then have to get a lowering monoleaf in the back or coilovers and I would definitely go coilovers here. I definitely would recommend strut bars. W-bodies are more rigid than N-bodies or other GM cars of the era, but still neeed help. For the front you can use the hard to find cutty vert bar or my car has had the Gen 2/GMPP bar attached to the strut tower covers. The rear you can get the AWEB bar which I don't think are being made by anyone at the moment or Rocketman here sells one too, and I think he is taking orders. The last thing you can do is an alignment ditching the worthless factory specs. Less camber front and rear and more caster up front helps a lot.