KONI 9905 1031 EVO FSD Rear Shock for 1993-Current Freightliner XC RV

Vehicle Fitment

• 1993-Current Freightliner XC, XCR, XCM & XCS Class A Motorhome Chassis (Rear Suspension)
• Also fits select Roadmaster RR4R, Alpine Peak & Spartan Summit motorhome chassis (rear)

Features

• KONI EVO 99 Frequency Selective Damping (FSD) rear shock for motorhomes/RVs
• Larger 50 mm piston bore for improved oil capacity, cooling, and responsiveness
• Patented open-intake valves filter harsh vibrations for smoother ride quality
• Heavy-duty twin-tube construction designed for large RV loads and long-distance travel
• Enhanced stability control - reduces body sway, pitch, and bounce on highways and rough roads
• Delivers comfort of luxury suspension with firm handling for safer braking/turning
• Improved damping across wide speed and terrain variations
• Direct rear replacement shock - no vehicle modification required

Specifications

• Part Number: 9905-1031
• Series: EVO 99 with FSD (Frequency Selective Damping) technology
• Position: Rear shock absorber
• Shock Type: Twin-tube, heavy-duty FSD
• Extended Length: Approx. 20.16 in (center-to-center)
• Collapsed Length: Approx. 13.15 in (center-to-center)
• Upper/Lower Mount: 3/4" ID eyelet mounts (19.1 mm)
• Compatible with rigid and mono-beam rear axles (Neway or V-Ride rear suspension on many Freightliner models):contentReference[oaicite:0]{index=0}

Included Components

• 1x KONI 9905-1031 EVO 99 FSD rear shock absorber
• Mount bushings as required (shock sold individually - replace both sides for optimal performance)

Product Description

The KONI 9905 1031 EVO 99 FSD Rear Shock Absorber is engineered specifically for Class A motorhome suspension systems, including Freightliner XC, XCR, XCM, and XCS chassis from 1993 to current model years. Part of KONI's advanced EVO 99 series with Frequency Selective Damping, this rear shock combines a larger-bore piston with patented open-intake valves to deliver a smoother, more controlled ride over long highway miles and rough road conditions. The result is reduced body sway, pitch, and bounce while preserving comfort - ideal for RV owners seeking both stability and ride comfort on extended trips.

Constructed for heavy-duty use, this shock absorber features durable twin-tube gas-charged technology and a 50 mm bore for increased oil capacity and thermal management. Direct replacement rear mounting with 3/4" eyelet mounts makes installation straightforward, and its design improves overall handling, comfort, and control in a wide range of motorhome configurations. For best performance and ride quality, shocks should be replaced in pairs.