The Bilstein B6 24-009331 is a rear 46mm monotube shock from the B6 4600 line, listed for the 1987 Chevrolet Blazer Custom Deluxe. Bilstein positions the B6 4600 as a direct-fit upgrade over factory shocks on stock-height light trucks and SUVs. Its single-tube body uses a high-pressure tube that keeps oil and nitrogen separated, and a velocity-sensitive digressive piston changes damping with road input. Compared with a worn factory unit or a budget shock, the appeal is consistency: the manufacturer says the design provides consistent, fade-free performance, and the B6 4600 line carries a Limited Lifetime Warranty.
Bilstein tunes each B6 application separately, so this rear unit is meant to match the Blazer's ride rather than simply stiffen the back end. Searchers looking for a 1987 Blazer rear shock upgrade, a stock-height K5 Blazer rear shock replacement, or a 24-009331 B6 4600 direct-fit swap will find that this part is built around factory mounting points. Blazer-specific DIY notes are covered in the sections below.
The manufacturer designs the B6 4600 as a direct-fit replacement for stock-height vehicles. If your Blazer has a lift, confirm fitment with the manufacturer before ordering.
The manufacturer lists a quantity of two per vehicle, so a pair covers both rear positions.
The manufacturer lists no spring seat included with this part number.
The manufacturer's mounting instructions for the B6 4600 and 5100 series say the shocks are designed to fit your vehicle's original shock mounts with no modifications. Those same instructions call for special tools and expertise, and recommend that installation be performed by a professional suspension technician, so weigh that before starting. The official procedure suggests removing inner fender wells will simplify installation, and that the vehicle be lowered such that its full weight is on the suspension prior to fully tightening the fasteners. Support the truck on stands rather than a jack alone. Owners on user forums describe the rear swap as manageable: drop the spare, lift the rear end, and there are 2 bolts on each one. Bring penetrating oil, since one owner on a related GM S-10 Blazer thread reported rusty bolts that slowed removal. Plan on roughly an hour per side.
