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Once disconnected from its shocks, sway bar, and such the rear axle easily swings down far enough to allow easy spring changes. If you’re duplicating our trackside development program we suggest fitting the lowering springs before going to the track. They make such a big difference there’s no need to test them—save the track time for shock and sway bar tuning. The Maximum rear Street Performance springs give 230-290 in-lb, which shows just how soft the rear of a Mustang needs to be compared to the front.