Name: KONI 9905-1031 EVO Rear Shock for 1993-Current Freightliner XC Class A Motorhome
Brand: Koni
SKU: 9905-1031
Price: 289.00 USD
Availability: InStock

KONI EVO Rear Shock for 1993-Current Freightliner XC Class A Motorhome (Part # 9905-1031)

KONI EVO Rear Shock for 1993-Current Freightliner XC Class A Motorhome (Part # 9905-1031)

: 9905-1031

In Stock(14)

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$289.00

$309.00

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Heavy-Duty Rear Shock Upgrade – KONI EVO FSD for Freightliner XC / Roadmaster RR4R / Alpine Peak / Spartan Summit-Alpine

Improve ride comfort and suspension control with the KONI 9905-1031 EVO FSD Rear Shock, designed for Freightliner XC diesel pusher Class A motorhome chassis and several other diesel motorhome platforms. Featuring KONI’s latest EVO Frequency Selective Damping (EVO FSD) technology, these shocks deliver superior ride comfort while maintaining the stability and control required for heavy motorhome applications.

The EVO FSD design combines KONI’s patented Frequency Selective Damping technology with advanced open intake valve design, allowing the shock to automatically adjust damping based on road conditions. The result is firm suspension control during cornering, braking, and large suspension movements while remaining smooth over expansion joints and rough pavement.

The EVO series features a large 50mm piston, nearly 40% larger than standard FSD shocks. This larger piston reduces internal pressure, improves cooling, and provides better responsiveness under heavy loads. Combined with KONI’s digressive valve stack and modular piston design, these shocks effectively control suspension movement while maintaining a smooth and comfortable ride.

If your diesel motorhome experiences rear suspension bounce, excessive body movement, or harsh ride quality, upgrading to KONI EVO shocks is one of the most effective ways to improve ride stability, suspension performance, and overall driving confidence.

Product Benefits:

Latest EVO FSD technology improves ride comfort and suspension control
Large 50mm piston improves cooling, durability, and responsiveness
Reduces rear suspension bounce and harsh ride characteristics
Improves stability and body control on diesel motorhomes
Ideal upgrade for Freightliner XC and similar diesel pusher chassis
Premium KONI engineering for long service life

Ideal For:

Freightliner XC diesel pusher Class A motorhomes
Diesel motorhomes with air suspension systems
Improving rear suspension stability and ride comfort
Reducing bounce and harsh ride over uneven roads
Long-distance RV travel and heavy motorhome applications

Applications:

1993-Current Freightliner XC – Rear Axle – Air Suspension
1993-Current Freightliner XC – Tag Axle
2002-2011 Monaco / Holiday Rambler / Safari / Beaver – Roadmaster RR4R 4 Air Bag Chassis (Ride Height 16"-16.5")
1997-2001 Spartan Alpine and Summit
1998-2006 Alpine Coach Peak Chassis
2011-2012 Monaco Vesta
2011-2012 Holiday Rambler Trip

The KONI 9905-1031 EVO rear shock is designed for Freightliner XC diesel pusher chassis and similar motorhome platforms. These coaches benefit from improved suspension damping to reduce rear suspension bounce and maintain better stability under heavy loads.

KONI EVO shocks provide a significant upgrade over factory shocks by delivering improved ride comfort, better suspension control, and enhanced stability on highways, bridges, and rough road surfaces.

Specifications:

Collapsed Length	Extended Length	Upper Mount	Lower Mount
13.25"	20.12"	Eye 3/4"	Eye 3/4"

Special Notes:

Sold individually.
Two shocks required per axle.
Designed for diesel motorhome chassis with air suspension.
Verify vehicle suspension configuration before ordering.

Other Information:

Q: What is KONI EVO FSD technology?
A: EVO FSD combines KONI’s Frequency Selective Damping with an open intake valve design and a larger 50mm piston to deliver improved ride comfort, better suspension control, and greater durability compared to standard FSD shocks.

Q: Are KONI EVO shocks better than factory diesel motorhome shocks?
A: Yes. KONI EVO shocks significantly improve ride quality, reduce suspension bounce, and provide better body control compared to most factory shock absorbers used on diesel pusher motorhome chassis.

Shock Comparison

Shock	Piston Size	Ride Comfort	Body Control
Factory OEM	Small	Poor	Poor
KONI FSD	36mm	Good	Good
KONI EVO	50mm	Excellent	Excellent

The state of California requires that this warning be posted for people purchasing products that reside in California.

WARNING: Products may contain one or more chemicals known in the State of California to cause cancer and/or birth defects or other reproductive harm. For more information, visit www.P65Warnings.ca.gov

Shipping Notice

In-stock items shipping via ground or flat rate are shipped within 48 hours. Expedited orders are prioritized and ship within 24 hours. Orders placed over the weekend, after Friday’s shipping cutoff, or on designated holidays will be processed on the next business day, and may not ship for up to 48 hours. For more information, please see our shipping terms.