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There is a design for a three-link rear end that utilizes a lift arm or pullbar where the LR spring is mounted in front of the rear end and the RR spring is mounted behind the rear end. When the car accelerates and the rear end rotates as the lift arm or pullbar moves, the LR spring compresses and the RR spring decompresses. This adds load to the LR wheel and takes load off the RR wheel. If this makes the rear tires more equally loaded, then the car will have more traction to help provide better bite off the corners.