Bilstein 33-104652 Suspension Shock Absorber - Rear

Bilstein B8 5125 Rear Shock for Lifted K30 and K3500

The Bilstein B8 5125, part number 33-104652, is a monotube shock absorber built for custom suspension setups that need a specific length and valving combination. This rear shock is listed for Chevrolet K30 and GMC K3500 applications with 2-2.5 inch rear lift, making it a direct fitment reference for lifted truck builds.

Key Features

• Bilstein B8 5125 series shock absorber for custom applications
• Part number 33-104652
• Non-adjustable damping with self-adjusting deflective disc valving
• 46mm monotube piston and smooth body design
• Eye-to-eye mount configuration with 5/8 inch eye bushings
• Collapsed length: 17.01 in; extended length: 28.00 in
• Zinc-plated finish with black bellows boot included
• Rear position application for lifted trucks

Product Details

Bilstein’s B8 5125 line is aimed at builders who need a shock absorber outside of direct OE-style catalog fitment. The 33-104652 shock uses a high gas pressure monotube design, a 46mm piston, and fixed valving tuned for controlled compression and rebound response. For Chevrolet K30 and GMC K3500 rear suspension setups with 2-2.5 inch lift, this shock provides the length and mounting style needed for custom or modified suspension geometry. This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.

What It Helps Address

• Excessive rear suspension travel after a 2-2.5 inch lift
• Inconsistent damping response from worn shock absorbers
• Rear axle control issues on lifted Chevrolet K30 and GMC K3500 trucks
• Shock length mismatch in custom suspension setups
• Reduced ride control from aging monotube or twin-tube units

Installation Notes and Tips

Verify collapsed and extended length before installation to confirm suspension travel clearance. This shock uses eye-to-eye mounting with 5/8 inch upper and lower eye bushings, so confirm the mounting points match the vehicle and lift height. For best results, compare the rear suspension geometry on your Chevrolet K30 or GMC K3500 against the listed dimensions before final assembly. Fits 1977-1986 Chevrolet K30, rear. Fits 1979-1986 GMC K3500, rear.

Quality Assurance

Bilstein B8 5125 shocks are built with a monotube internal design, zinc-plated finish, and application-specific valving for custom suspension use. The B8 5125 product line is engineered for builders who need consistent shock dimensions and mounting options across modified truck applications.