BST BSSP 2" Rear Drop Leaf Spring Shackle Lowering Kit — Left & Right 411420 for 2011–2019 Chevy Silverado / GMC Sierra 2500HD/350

BST BSSP 2" rear drop shackles (part 411420) lower the rear of 2011–2019 Chevy Silverado and GMC Sierra 2500HD/3500HD trucks by two inches while preserving ride quality and load capacity.

This lowering kit replaces the factory rear leaf spring shackles with a matched left and right pair engineered specifically for the 2011–2019 Chevrolet Silverado and GMC Sierra 2500HD and 3500HD models, both 2WD and 4x4. Finished in a protective powder coat, the shackles are made to resist corrosion and wear from daily driving, towing, and seasonal exposure. The design maintains proper spring geometry so ground clearance is reduced without compromising spring function.

How will these drop shackles affect driving and clearance?

Lowering the rear by two inches alters the truck’s stance for a flatter look and slightly lower center of gravity. Handling at normal speeds remains similar; however, severe off-road use or extreme suspension travel may encounter reduced clearance. These shackles are intended for street-driven trucks or lightly loaded work trucks where a modest drop is desired.

• Reduces rear ride height by approximately 2 inches
• Improves rear stance and level appearance front-to-back
• Maintains leaf spring function and payload capability
• Not recommended for aggressive off-road articulation

What does the kit include and how durable is the finish?

The kit ships with a matched left and right shackle set, each manufactured to fit the specified GM trucks. A gunmetal-gray powder coat covers the parts to guard against salt, chips, and corrosion encountered during regular use. Fasteners or additional hardware requirements depend on the truck’s existing components and installation choices.

• Includes two powder-coated drop shackles (left and right)
• Part number 411420 for easy identification
• Powder coat improves resistance to rust and surface damage
• Designed to fit OEM mounting points for straightforward installation

How difficult is installation and will I need extra parts?

Installation is a bolt-on swap at the leaf spring shackle locations and can often be completed with common hand tools. Depending on condition of the truck’s mounting bolts and bushings, you may choose to replace fasteners or rubber bushings for best results. A torque wrench and basic shop safety equipment are recommended to ensure secure attachment and proper alignment.

• Typical install uses factory mounting points—no cutting or welding required
• May require replacement bolts or bushings if original hardware is worn
• Professional installation recommended if you’re unfamiliar with suspension work
• Estimated install time: 1–3 hours per side depending on tools and rust

Who is this for? This BST BSSP 2" Rear Drop Lowering Kit is aimed at Silverado and Sierra 2500HD/3500HD owners who want a cleaner, lower rear profile without extensive suspension modification. It suits daily drivers, show trucks, and work trucks that need a modest lowering while keeping payload and towing capability. If you require significant off-road travel or plan to carry heavy, uneven loads frequently, consider consulting a suspension specialist to confirm this kit matches your use case.