Are the coil spring perches directly on top of the axle, or are they on the arms? If they are on top of the axle, for jounce and rebound, just use the direct 1:1 motion. For body roll, use the ratio of the distance separating the spring perches to the distance separating the tire contact patches - that's how much the springs move relative to the tire contact patch (relative to the body).
Given the quote above from Brian Petersen does this spreadsheet use the correct formulas for the rear axle?
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