Name: KONI 99B-3209 EVO Front Shock for Alpine, Monaco, Spartan & Tiffin Class A Motorhome
Brand: Koni
SKU: 99B-3209
Price: 299.00 USD
Availability: InStock

KONI EVO Front Shock for Alpine, Monaco, Spartan & Tiffin Class A Motorhome (Part # 99B-3209)

KONI EVO Front Shock for Alpine, Monaco, Spartan & Tiffin Class A Motorhome (Part # 99B-3209)

: 99B-3209

In Stock(6)

Based on 0 reviews.

$299.00

$368.55

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Sale ends 03/31/2026 at 11:59:59

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Heavy-Duty Front Shock Upgrade – KONI EVO for Alpine Peak / Roadmaster RR4R / Workhorse R26 UFO / Spartan MountainMaster I-Beam / Tiffin Phaeton PowerGlide I-Beam

Upgrade the ride and durability of your diesel motorhome with the KONI 99B-3209 EVO Front Shock, designed for several popular diesel pusher Class A motorhome chassis including Alpine, Monaco, Spartan, Workhorse UFO, and Tiffin platforms. This shock is the heavy-duty replacement for the previous KONI FSD 8805-1021 front shock used on many of these chassis.

After years of real-world use, it became clear that the original FSD shock was not always able to withstand the weight and demands of certain motorhome chassis. KONI engineers performed extensive testing and developed the 99 Series EVO shock, built to provide improved durability, better ride control, and increased comfort for heavy diesel motorhomes.

The 99 Series EVO design features a 50mm piston, nearly 40% larger than the piston used in the previous 8805 series shocks (36mm). The larger piston allows the shock to handle greater forces while operating at lower internal pressure, improving both performance and long-term durability.

Originally developed for high-end European motorcoaches, the KONI 99 Series is now being introduced into the North American RV market to deliver better ride comfort, improved suspension control, and greater reliability for heavy motorhome chassis.

If your diesel motorhome suffers from excessive front-end bounce, poor body control, or worn-out factory shocks, upgrading to the KONI 99B-3209 EVO shock is one of the most effective ways to improve ride quality, suspension performance, and driving stability.

Product Benefits:

Heavy-duty EVO shock designed for large diesel motorhome chassis
Large 50mm piston improves durability and suspension control
Designed to replace earlier KONI 8805 series FSD shocks
Reduces front-end bounce and harsh ride characteristics
Improves steering stability and ride comfort
Engineered for demanding diesel pusher motorhome applications

Ideal For:

Diesel pusher Class A motorhomes
Motorhomes with I-Beam front suspension
Improving ride control on heavy motorhome chassis
Replacing worn-out factory or earlier FSD shocks
Long-distance RV travel and heavy-duty use

Applications:

1998-2006 Alpine Coach – Peak Chassis
2002-2011 Monaco & Holiday Rambler – Roadmaster RM4C, R4R & RR4R (4 Air Bag Chassis)
2007-2008 Workhorse R26 UFO – Rear Gas Engine
1996-2004 Spartan MountainMaster – I-Beam Front Suspension
1991-1995 Spartan MC2000
2008-2019 Tiffin Phaeton – PowerGlide with I-Beam Front Suspension
Safari Sahara – 8 Air Bag Chassis (4 Shock Configuration)
2011-2012 Monaco Vesta
2011-2012 Holiday Rambler Trip
2013-2015 Entegra Aspire – Spartan MountainMaster I-Beam Eaton Axle (Excludes Model 1253 Axle)

The KONI 99B-3209 EVO front shock replaces the earlier KONI 8805-1021 FSD shock used on many of these diesel motorhome chassis. The larger piston and updated valving provide improved durability and better ride control for heavier motorhomes.

Specifications:

Collapsed Length	Extended Length	Upper Mount	Lower Mount
15.00"	23.75"	Eye 3/4"	Eye 3/4"

Special Notes:

This shock replaces KONI part number 8805-1021.
Shock body diameter is 2.75".
Some Spartan applications may have limited clearance.
If equipped with Reyco Granning 1200 axle, verify clearance before installation.

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

i have a work horse 22 winabago 2007 we had bilstein 24-268097 and 24-186629 shocks on it in the past will the koni 99 series shocks fit the front ? ( brandon, 06/28/2024 )

Hello, the W22 chassis calls for the Koni FSD's , 8805-1001's and the 07 takes 8805-1002's in the rear . We do not list an EVO for that chassis.

Hi,

Will this shock 99B3209 work on the front of my Freightliner S2RV chassis? It’s a renegade super C. ( John Young, 05/25/2023 )

Dimensionally, the compressed and extended lengths are very similar. The OEM shock is 14.33" compressed and 22.80" extended. The 99B-3209 is 14.92" compressed and 23.59" extended. The unknown is where the width of the mounts for the shock are the same or different. The OEM shock appears to have "ears" that stick out from the bushing on either side which leads me to think they might be a little wider than the 99B-3209. This could be overcome with some spacers or even washers but I can't confirm exact fit for this application.

I would like to order 2 Koni 99B-3209 Front shocks for my 2007 Monaco Holiday Rambler Neptune XL with a Roadmaster RR4R chassis. Are these a good fit and what would I order for the rear?
The coach has 46,580 miles on it and I have noticed the front porpoising from time to time, I'd also like to improve the ride. ( Tom Wise, 08/08/2021 )

Hi Tom,

Based on your VIN provided the 99b-3209 are the correct shock for the front of your coach. The rear calls for 8805-1022. From the complaints you are trying to correct I would say, yes these are a great place to start!

I would like to order 2 Koni 99B-3209 Front shocks for my 2004 Western Alpine motorhome. Can you let me know when they are back in stock? Thanks, Kent D. Zehring. 717-554-5580 ( Kent D Zehring, 02/27/2021 )

We should have 99B-3209 in stock around the first week of April, 2021.

I have a 2008 UFO chassis, can you get FSD shocks front and rear? ( Kip Barker, 07/09/2020 )

You would use the Koni EVO 99B-3209 for the front and the Koni FSD 8805-1002 for the rear.

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