FRONT Koni EVO Shock for Alpine, Monaco, Spartan & Tiffin Class A Motorhome (Part Number 99B-3209)

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

Experience a smooth controlled ride on your Class A motor home with Koni EVO 99 shock absorbers. Koni's patented open intake valves ensure that you get a smooth ride along with enough force to keep your RV from bouncing down the road. EVO 99 is especially good on independent front suspensions that have a limited amount of shock travel. Large piston holes and custom tuned valve stack ensure that you have extra body control when you need it without undue harshness. You don't want poor road conditions to spoil your cross-country trip. Our 50mm bore piston reduces internal pressure for smooth operation over rough roads, and our digressive valve stack and modular piston design control bouncing over bridges and large bumps.

This is the New Front Heavy Duty replacement shock for the Koni FSD part number 8805-1021 used previously on the front axle of the Alpine Peak, Roadmaster RR4R, Workhorse UFO & Spartan MountainMaster I-Beam chassis. It became evident after a few years that the FSD just wasn't holding up to the weight and demands of these chassis. The Koni engineers went to work and did real world testing to come up with a shock that would increase the ride comfort yet be built to withstand the most punishing demands thrown its way.

The main difference between the 8805 and the 99 series piston is that it is almost 40% larger than the 8805 series (50 mm vs 36). Which means it can take a lot more force, or the same force with less pressure. This improves durability and performance. The 99 series is also Koni's latest shock design. It was developed for high end motorcoaches in Europe, and Koni is just starting to introduce it in America in the RV market. Both shocks control up and down movement, but Koni has found a better balance between the two with the 99 series setting.

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 with I-Beam Front Suspension

• 1991-1995 Spartan MC 2000

• 2008-2019 Tiffin Phaeton w/ PowerGlide with I-Beam Front Suspension

• Safari Sahara (8 Air Bag but only 4 Shocks)

• 2011-2012 Monaco Vesta

• 2011-2012 Holiday Rambler Trip

• 2013-2015 Entegra Aspire with Spartan MountainMaster I-Beam Eaton Axle (Excludes Model 1253 Axle calling for B46-2150 due to axle clearance)
  

  
  

  Note: Some Spartan applications do not have enough clearance to accommodate the larger diameter of this shock. Please measure your existing shock diameter if you have a Reyco Granning 1200 axle, the 99B-3209 is 2.75" in diameter.