Bilstein B8 8100 ZoneControl R DSA Rear Shock Absorber - Ford F-250 / F-350 Super Duty 2017-2026

The B8 8100 is a monotube rear shock absorber built around a 60mm piston in a 2.65 in outside diameter body, with a remote reservoir carried on a billet mount. Click adjuster knobs set low speed compression across 10 settings and high speed compression across 20, so damping can be tuned separately for road surface and for impacts. ZoneControl R adds a second piston that delivers position sensitive rebound damping, which eliminates harsh suspension top-out events and removes the need for an external limit strap. Valving is velocity sensitive and digressive, tuned per application, and this shock is calibrated for 0 to 1 in of rear lift.

Specifications

This part fits:

Shipping

• In-stock orders placed before 3 PM EST ship the same day — everything else ships within 24 hours.
• Standard, expedited, and overnight options at checkout.
• Oversized items ship by freight and take longer.
• Backordered items ship as soon as stock lands — contact us for lead times.
• International orders: prices do not include VAT, duties, or import fees. Your country charges these at import and they are the buyer’s responsibility.

Returns

• 30-day returns on new, uninstalled items in original packaging with all hardware.
• Standard returns: 8% restocking fee, buyer pays return shipping. Both waived if the item is defective or we made the error.
• Installed or used parts can’t be returned — confirm fitment before you install.
• Special orders and custom items are final sale.
• Email us for return authorization before shipping anything back.

Full details: Shipping Policy · Refund Policy