Vehicle Shackles- Lower
Shackles are used on a vehicle's suspension, in order to secure the end of a leaf spring to the vehicles frame. Shackles are typically attached to the back side of the leaf spring, while the front side of the spring is connected to the vehicle's frame. Vehicles which are designed for "off-roading" commonly use a shackle on the front of the leaf spring, due to the rough terrain experienced by an off-road vehicle. Shackles are used in order to assist the spring in remaining intact when compressed, and not elongated. Steel is commonly used to make shackles, however, other metals may be used, depending on the vehicles size, and desired application. At the bottom of the shackle there is a bushing, which is typically made from polyurethane, which has the ability to withstand pressure without much friction, or noise. In order to prevent wear, and damage, it is recommended that the shackle's bushings be lubricated during routine maintenance.
Shackles are commonly used when lowering a truck. Shackles are necessary, due to the back end of a truck, being higher than its front. A trucks rear end is higher than its front, due to the truck's ability to accommodate cargo weight in the truck bed, or the weight of towing a trailer. Lowering the rear-end of the truck, versus, lifting the front end, is very common, and does not affect how the vehicle operates. Shackles are capable of lowering the suspension 1” to 3”, and the amount able to be lowered, is vehicle specific. Shackles are easily installed, and removed, and are commonly used to balance the vehicle's suspension, which may be level, due to worn out springs.
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