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The KONI FSD component identified by manufacturer part number 9905-1031 is supplied for the exact configuration described as KONI EVO99 w/FSD RV Rear Shock Absorber Freightliner XC (PN 9905-1031). Match the complete part number, position, suspension design, and every application requirement before ordering.
Key Features
- Part Number: 9905-1031 Mounting Specifications: Upper Mount Type: Eye 3/4" (19.15mm) Lower Mount Type: Eye 3/4" (19.15mm) Extended Length: Approximately 24.13 inches Collapsed Length: Approximately 15.04 inches Installation Hardware: Not included, ensure compatibility with your vehicle’s existing mounting setup.
- Enhanced Handling and Stability: Large 50mm bore pistons and custom-tuned valve stacks ensure precise body control, minimizing sway, pitch, and bounce for safer cornering, braking, and acceleration.
- Superior Durability: Constructed with 9-ton strength and increased oil capacity, these shocks are built for the heavy demands of RV travel, extending tire and suspension life while maintaining peak performance.
- Proven Reliability: Trusted by RV owners and backed by Koni’s 90-year legacy of innovation, these shocks are designed in the Netherlands with high-quality materials for lasting performance.
- Its advanced EVO 99 technology, featuring a 40% larger piston than standard FSD models, reduces internal pressure for cooler operation and faster response, ensuring longevity and consistent performance.
- Does not fit chassis with Hendrickson VTEK NXT (VFS) I-Beam front axle (2023+ models) or spring suspensions.
Fitment
Exact vehicle fitment requires chassis, coach, axle, suspension, and application verification. No unsupported year-make-model tag has been assigned.
Specifications
| Brand | KONI |
|---|---|
| Manufacturer Part Number | 9905-1031 |
| Series | FSD |
| Product Type | Shocks and Struts |
| Position | Rear |
| Fitment Type | Fitment Verification Required |
| Enhanced Handling and Stability | Large 50mm bore pistons and custom-tuned valve stacks ensure precise body control, minimizing sway, pitch, and bounce for safer cornering, braking, and acceleration. |
| Vibration-Free Ride | A specialized valve filters out road vibrations before they reach the cabin, delivering a quiet, comfortable ride unmatched by standard shocks. |
| Proven Reliability | Trusted by RV owners and backed by Koni’s 90-year legacy of innovation, these shocks are designed in the Netherlands with high-quality materials for lasting performance. |
| One (1) Koni EVO FSD Rear Shock Absorber (SKU | 9905-1031), individually packaged for secure delivery. |
| Part Number | 9905-1031 |
| Upper Mount Type | Eye 3/4" (19.15mm) |
| Lower Mount Type | Eye 3/4" (19.15mm) |
| Extended Length | Approximately 24.13 inches |
| Collapsed Length | Approximately 15.04 inches |
| Installation Hardware | Not included, ensure compatibility with your vehicle’s existing mounting setup. |
What's Included
- One KONI component in manufacturer packaging
Mounts, springs, bump stops, dust boots, bearings, fasteners, and adjustment tools are included only when listed for the exact kit.
About KONI
KONI develops hydraulic damping products for passenger vehicles, performance applications, commercial vehicles, motorhomes, and motorsport. Product families use different adjustment methods and damping technologies, so the exact part number controls fitment and function.
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Frequently Asked Questions
How do I confirm this KONI part fits my vehicle?
Match the complete part number, year, make, model, axle position, suspension type, drivetrain, chassis, and every exclusion or equipment note.
Is this KONI listing for one component or a complete kit?
One KONI component in manufacturer packaging. Replace dampers in axle pairs when required by the manufacturer and confirm every additional mount, spring, boot, stop, and fastener needed.
Is this KONI damper adjustable?
Adjustment depends on the exact KONI series and part number. Some products are externally adjustable, some require removal for adjustment, and others use fixed or frequency-selective damping.
Installation Instructions
- Verify the exact part number, application, position, suspension configuration, and package contents before disassembly.
- Support the vehicle safely and follow the factory service procedure for spring and damper removal.
- Transfer or replace mounts, bearings, boots, bump stops, and hardware only as specified for the application.
- Torque all fasteners at the specified suspension position and complete an alignment whenever suspension geometry is disturbed.
- Confirm clearance, fastener torque, ride height, and damper operation before normal driving.
KONI
Shop KONI shocks, struts, Special ACTIVE dampers, Sport shocks, STR.T dampers, GTS coilovers, suspension kits, RV dampers, bump stops, and service components by exact manufacturer part number and verified application. Confirm the complete vehicle or chassis, axle position, suspension design, and every equipment note before ordering. KONI Product Families KONI suspension products include Special and Special ACTIVE comfort-control dampers, adjustable Sport products, fixed-valving STR.T dampers, FSD technology, GTS coilovers, Heavy Track and RAID applications, RV dampers, motorsport inserts, and supporting hardware. Choosing the Correct KONI Part Match the complete KONI manufacturer part number Confirm normalized year, make, model, chassis, axle position, drivetrain, and suspension type Review every exclusion for electronic damping, self-leveling suspension, factory sport packages, and strut diameter Confirm whether the listing includes one component, an axle pair, or a complete kit ...
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