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Spring Over Suspension Flex

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In a spring-over axle scenario the leaves have a hard time controlling axlewrap, especially with a long, flat, flexible leaf spring, due to increased leverage. Spring wrap occurs under hard acceleration with large tires and good traction, such that the pinion of the axle wants to move upward in the opposite direction of the tire rotation. This in turn can twist or “S” the soft leaf springs. Shock placement (one fore, one aft on the axletube) and antiwrap bars can help counter axlewrap but can hinder axle movement, ground clearance, and articulation.