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Tuff Country's 4" Suspension Lift Kit for the Silverado and Sierra reintroduces their upper control arm design kits. These systems are affordable and simple to install. They feature tubular upper control arms along with upper coil/strut spacers, differential drops and a replacement differential skid plate lift the front of the vehicle by 4 inches and cast iron blocks with extended u-bolts that lift the rear by 2 inches.