The Bilstein B6 Performance 24-021487 is a 46mm rear monotube damper built to replace the factory rear shock on 1987–1993 V8 Mustangs. It uses the gas-pressure monotube architecture that the manufacturer says it pioneered in 1957, and it is designed to work with your existing factory springs, so you can upgrade the rear damping without swapping springs. The manufacturer notes that a monotube body sheds heat faster than a twin-tube OE shock during sustained driving, which matters on canyon runs, autocross sessions, and highway pulls where stock units can fade. Searchers looking for a Foxbody 5.0 rear shock upgrade, a gas-pressure monotube Mustang rear damper, or a 24-021487 factory-spring replacement will find this is a straightforward drop-in option.
Compared with a budget rear shock, the B6 is a damper tuned to the car's factory spring rates rather than a generic street valve, and it keeps the ride comfortable enough for daily driving. Before ordering, confirm the trim-level fitment for your specific car, since listings differ on which Mustang variants and early-year cars the part covers. Owners on user forums report that the part number matches the '87–'93 range, which supports the 1987–1993 application.
The manufacturer states that the B6 line is designed to pair directly with factory springs, so no spring change is required to install these rear dampers.
Details vary. The installation instructions have cited a figure around 35 ft-lb, but owners on user forums report that reaching that number can crush the rubber mount bushings and pinch the cup washers. Some owners tighten until the bushing bulges slightly. Confirm the current spec with the manufacturer's instruction sheet before torquing.
This is a bolt-in rear shock swap, but the upper mount is where most DIYers slow down. Support the car securely on jack stands while the rear is off the ground, and disconnect the shock from the axle before removing the upper nut. Owners on user forums report that the mount plates can rotate or squirm out of position as the bushings compress, so set the plate orientation before final tightening. Also check the rear axle and bushings for binding if the car feels stuck in compression after the swap; owners on user forums suggest unbolting the shocks temporarily to determine whether the shock or the axle is the source.
