Here's the service manual section regarding spring rates. Sorry for the tiny font and crap quality My front springs are the "red/blue" marked ones on the bottom. Notice how none of the of the measurements in any force unit are provided with a corresponding length unit. AKA it's not listed as lbs/in or N/mm or anything like that. Also it lists a range for each force unit give toon Not much sense I can make from that. MAYBE these are the total compression force of the spring at block height, but a ~600lb force over 6.9" travel (I don't know exactly what the max spring travel is but that's the stock damper travel listed elsewhere in the document. It couldn't be much less that that) equals about 85lbs/in which doesn't make much sense either. The total weight on the front axle would almost fully compress two springs of that rate.
I took the front spring to Motion Control Suspension here in Atlanta to measure it on their shock dyno / load cell and they came up with a roughly ~250lb/in rate. That measurement corresponds pretty closely with calculations I did of the suspension sag (or whatever the correct term is) at normal ride height based on a rough guess of the vehicle weight.
I only acquired the car 10 years ago so I don't know it's full history. However, the car isn't lowered at all, it doesn't have any other suspension upgrades so I can't imagine these are anything but the stock springs.
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