The Bilstein B6 4600 rear shock for the 2015-2016 Ford F-150 is a monotube, gas-pressure replacement for the factory rear damper. The manufacturer frames the B6 4600 series as a stock-height replacement for light trucks, and says its monotube body is built to keep damping steady without fade. For a daily-driven truck, that is the main reason to upgrade from a generic rear shock. The manufacturer also says the valving uses a velocity-sensitive digressive piston that adapts to changing road conditions, so small bumps stay compliant while larger inputs get firmer control. Owners on user forums say the B6 4600 is not overly stiff and is a clear step up from factory units. Search terms this part matches include 2015 F-150 rear shock upgrade, Bilstein B6 4600 stock height rear shock, F-150 monotube rear shock fade-free, and 33-253213 rear shock replacement.
Fitment is where buyers should slow down. Details vary across sources: some list this rear shock for 2WD or RWD trucks, others for 4WD applications, and year coverage is listed anywhere from 2015-2016 to 2015-2026. Owners on user forums note that Bilstein's own configurator points to the 4600 for this truck, which is a useful starting point, but you should confirm the application against your VIN and drive type with the manufacturer before ordering. Because this is a stock-height shock, it is designed to restore factory ride height and damping rather than add lift.
Neither. The manufacturer designs the B6 4600 series for trucks at stock ride height, so it is meant to replace worn factory shocks without changing the truck's stance.
Owners on user forums describe the 4600 as a popular daily-driver choice that is not stiff and is much better than factory shocks. Some owners who dislike the bright yellow finish point to the 5100 instead.
Yes, replace them in pairs so both sides of the rear axle have matching damping. Quantity per listing varies, so check the number of shocks included before ordering.
Owners on user forums describe the rear swap as a manageable weekend job that can take well under an hour once the truck is safely supported on jack stands. The common tools are an 18mm wrench and a 15mm socket. Forum regulars recommend lifting the truck from the frame rather than the axle, since that lets the suspension open up and makes the old shock easier to remove and the new one easier to seat. Many owners leave the tires on for the job. Torque specifications vary by thread code, so use the manufacturer's installation sheet and a torque wrench rather than a generic number.
