The Bilstein B8 8100 (DSA) is a large-bore reservoir shock for 4WD Ford F-150 trucks with a light rear lift. Its 60mm monotube body and remote reservoir give it more oil volume than a typical stock damper, and the manufacturer says that extra capacity helps control heat over rough, long-distance driving. Dual Speed Adjustment click knobs let you set low-speed and high-speed compression separately, so you can firm the rear for a loaded bed or soften it for daily driving. A fixed-valve replacement cannot offer that tuning range.
Confirm fitment before you order. The product title lists 2015-2024 trucks and a 0-0.5 inch rear lift, while the manufacturer's application listing covers 2015-2026 F-150 models, and published lift-range details vary. Check your model year and rear lift against the manufacturer's documentation. The shock uses 12mm eye mounts at both ends, an 18mm shaft, and an EVO Grey finish, and you need two per truck. Plan for a rear-axle job that calls for a floor jack and patience at the lower mount.
The manufacturer lists a quantity of 2 per vehicle and specifies click adjusters for both high-speed and low-speed compression.
The manufacturer lists a replacement mounting kit under part number B4-KT2-Z020A00 for this shock.
The manufacturer lists 12mm eye mounts at both the upper and lower positions. Confirm the factory mount configuration on your specific truck before ordering, because published lift and year details vary.
This is a rear-axle swap that most mechanically inclined owners can handle with a floor jack, a standard socket set, and a long flat-head driver or pry bar. Owners on user forums commonly report that compressing the shock with a jack helps seat the lower eye into its mount, and that guiding the lower end into place can take more effort than expected. The manufacturer provides installation instructions, so review them before you start. Verify the reservoir orientation and confirm wheel backspacing and tire size before you install.
