The Bilstein 24-181488 is a rear shock from the B6 4600 line, a 46mm gas-pressure monotube damper. The manufacturer describes the design as nitrogen-charged, with a floating dividing piston that separates gas and oil to give consistent, fade-free damping. It uses digressive valving that responds to changing road surfaces and vulcanized neoprene bushings. Compared with a basic replacement, that pressurized monotube construction is the main reason to pay more. The manufacturer also states that the B6 4600 does not require a spring change, so you can keep the original coil springs and upgrade only the damping. Searchers looking for a VW Beetle rear gas shock, 46mm monotube rear shock, or swing axle rear shock upgrade will find this part's key specifications below.
This is a rear damper for the swing-axle suspension used on classic air-cooled Volkswagens. Fitment in the Beetle, Karmann Ghia, and Transporter is the most important thing to verify, because the year ranges published for this part are not consistent, so confirm your exact year and model with the manufacturer before ordering. Installation is a bolt-on job with basic hand tools, and the manufacturer's guidance on orientation matters. The manufacturer says the Bilstein label should be upright and readable once the shock is mounted, and the lower end of the boot has drainage holes so water and debris can escape. Owners on user forums, mostly describing trucks, note that rusted lower mounting hardware is the usual frustration, so penetrating oil and a patient approach help. Support the axle properly before you remove the original units.
The manufacturer says the Bilstein label on the shock body should be upright and readable when the shock is mounted on the vehicle. The boot's lower end has drainage holes, so water and debris can escape if the boot is oriented downward.
The manufacturer states that the B6 4600 line does not require a spring change and that the original springs can be used.
This is a swing-axle rear shock replacement that uses basic hand tools, a floor jack, and jack stands. Raise and fully support the car, then support the axle so it does not drop when you remove the original shocks. Check the upper and lower mounts for corrosion before you start, and apply penetrating oil if the hardware is seized. Install the upper mount first to hold the shock in place, then bring the lower eyelet into position. Verify the label is upright before you torque the fasteners. Confirm torque values and any orientation specifics against the manufacturer's installation documentation for your exact application.
