that's 3 inches per side, ~60# change in rate, that's pretty substantial.
No, IMO, it is not.
30# per spring, 60# total for the axle. As a percentage of rear roll couple, its even less. I'd bet that are maybe 10-12 guys on this entire site that can feel that slight of change. Coil springs are only available down to 50# difference per side, which is only 10# less, on a single side, than the 60# total we're talking about. To change the entire axle spring rate would be 100# difference, 40# MORE than we're talking about. Lets put it this way, if you are a good enough driver to feel the difference in under/over steer between a full tank of gas and a half tank of gas, then you are good enough driver to feel a 60# spring rate change. The rest of us are simply mathematically masturbating.
