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Right above the rear axle is a long rubber bushing called the Axle Bumpstop - this prevents the axle housing hitting the floor pan under extreme compression of the suspension - If you are lowering your Mustang - the stock Axle bumpstop is too long and it will hit the rear axle housing when you go over even smal bumps. This BBK polyurethane axle bump stop bushing is much shorter and must be used when installing a lowering spring kit on your car. This is a simple direct bolt on to your stock axle bump stop location with a single bolt. | 
