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:
For Chevy Silverado/GMC Sierra 99-06
Specification:
Product type: Lowering shock
Drop height: 2”-4”
Material: High Tensile Strength Carbon Steel
Finish: Powder coated
Bushing material:Rubber
Diameter of piston rod:12.5mm/ 0.49inch
Piston diameter:30mm/ 1.18inch
Outer cylinder diameter: 45mm/ 1.77inch
Extended length:566mm/ 22.28inch
Collapsed length:366mm/ 14.40inch
Travel range: 200mm/ 7.87inch
Nitrogen charged:Yes
Dust cover equipped:Yes
Feature
*High-pressure nitrogen charged twin-tube shock absorber with high durability.
*Rubber bushings for better absorption.
*Powder coated surface：provides superior corrosion resistance.
*12.5mm Chromed Hardened Piston Rod.
*30mm Diameter Sintered Iron Piston.
*45mm Shock Body helps Heat dissipation.
*Precision Welding.
*Easy bolt-on installation
*High Tensile Strength Carbon Steel for optimal durability and fitment.