Pair Rear Lowering Shocks 5" - 7" Drop Fit for Chevy Silverado/GMC Sierra 99-06 57494423Introduction: When you lowered your vehicle with shortened coil springs, the stock shocks will not be valved correctly and will sit too far down in their "stroke" to work as intended and will blow out more quickly. So you will need drop lowering shocks. They are designed to lowered vehicled and provide ride improvement and travel required. Application: Fit for Chevy Silverado GMC Sierra 99 06 Specification: Product type: Lowering shock Drop height: 5