The Bilstein B8 Performance Plus is the manufacturer's sport shock for lowered cars, and this rear unit is listed for the 1981 to 1985 Mercedes-Benz 300SD. The BILSTEIN B8 is BILSTEIN's sport shock absorber for lowered cars. It uses monotube gas-pressure damping in a yellow monotube body, and the manufacturer says it is made in Germany. The manufacturer's fitment list covers the 300SD for 1981 through 1985.
Stock shocks are tuned for factory ride height, so a lowered 300SD benefits from a damper that is matched to that geometry. The manufacturer says the B8 is shortened by design to keep the right spring preload and travel with lowering springs, and the monotube design holds damping consistent under hard, repeated load. Owners on user forums report that Bilstein's guidance is to use its B6 on standard-height cars and the B8 on cars with lowering or sport springs, so the choice depends on your spring setup. Search terms this suits include 300SD lowering spring rear shock, 1981-1985 300SD sport damper, and yellow monotube gas-pressure Mercedes shock.
Installation is designed to be straightforward. The manufacturer describes the B8 as a direct fit that installs like OE, with no extra modifications, and it does not require replacing your lowering springs. The B8 keeps your lowering springs in place, with no need to swap them or add hardware. Owners on user forums working on other platforms advise replacing worn rubber shock mounts and spring pads during a shock-and-spring job, which is worth checking on this 300SD as well.
No. The manufacturer states the B8 is a shock absorber, not a spring, so the drop comes from the lowering springs you install. The B8 is engineered to work correctly with them.
The manufacturer's fitment list shows the 300SD for 1981 through 1985. Fitment lists can differ between sources, so confirm your vehicle's year and submodel against the manufacturer before ordering.
Owners on user forums report that Bilstein recommends its B6 for standard-height cars and the B8 for cars with lowering or factory sport springs. If your car is at stock height, check with the manufacturer before choosing the B8.
The manufacturer describes the B8 as a bolt-in replacement that installs like the original shock, so no custom fabrication is expected. Plan on a standard rear shock replacement with the car safely supported, and do not fully tighten the upper and lower fasteners until the suspension is loaded. Owners on user forums suggest replacing rubber shock mounts and spring pads at the same time, since they wear and are inexpensive compared with the labor of a second install. Confirm torque specifications in the manufacturer's service documentation.
