Premium Koni EVO 99 shock absorber engineered for Freightliner XC chassis with ZF Independent Front Suspension. Professional-grade comfort and control for Class A motorhomes.
The SuperSteer 99B-3262 represents the next evolution in RV suspension technology. Built on Koni's revolutionary EVO 99 platform, this shock absorber transforms your motorhome ride from ordinary to extraordinary. Industry-specific design and engineering result in maximum driver and passenger comfort, reducing axle-induced chassis vibration and noise to an absolute minimum for a limousine-like driving experience.
Developed originally for high-end European motorcoaches, the EVO 99 technology features a 50mm piston that's 40% larger than previous designs, providing exceptional control without harshness. The patented open intake valves ensure smooth cruising while maintaining enough force to prevent bouncing, even on rough roads or in high winds. With 9-ton tensile strength construction and Koni's lifetime warranty for the original purchaser, this shock absorber is engineered to go the distance.
40% larger piston than previous models delivers superior control with lower pressure for improved durability and comfort
Industry-leading tensile strength handles the demanding conditions of RV travel, from highway winds to rough roads
Koni backs the EVO 99 with a lifetime warranty for the original purchaser, ensuring long-term peace of mind
Open intake valves and custom valve stack provide optimal balance between comfort and control in all conditions
The SuperSteer 99B-3262 is the direct replacement and upgrade for discontinued Koni shock part number 90-1922. If you're currently running the older 90-1922 model, this EVO 99 version provides the same fitment with significantly enhanced performance, comfort, and durability thanks to the revolutionary EVO technology platform.
While experienced DIY mechanics can install these shocks, professional installation is recommended for best results. Each shock weighs 11 lbs and proper installation is critical for optimal performance and safety. SuperSteer estimates approximately 0.75 hours installation time per pair (front or tag axle) for experienced technicians. Important: This listing is for ONE shock absorber. Front applications require TWO shocks (one per wheel). Tag axle applications also require TWO shocks. Order the appropriate quantity for your application.
FRONT Applications (Requires 2 Shocks): • Freightliner XC with ZF IFS (2002-Current) • Freightliner XCR with ZF IFS (2002-Current) • Freightliner XCM with ZF IFS (2002-Current) • Freightliner XCS with ZF IFS (2002-Current) • Tiffin Powerglide Allegro Bus with ZF IFS (2010-Current) • Tiffin Powerglide Phaeton with ZF IFS TAG AXLE Applications (Requires 2 Shocks): • Freightliner XC, XCR, XCM, and XCS Chassis with Steerable ZF Tag Note: This shock is specifically designed for ZF Independent Front Suspension (IFS) systems and steerable ZF tag axles. Verify your chassis has ZF IFS before ordering.
Package Contents: • (1) Koni EVO 99B-3262 Shock Absorber • Installation Hardware (if applicable) • Warranty Documentation Important Ordering Information: • Price shown is for ONE shock absorber • Front suspension requires TWO shocks (order quantity: 2) • Tag axle suspension requires TWO shocks (order quantity: 2) • Total shocks needed for complete front upgrade: 2 • Total shocks needed for complete tag axle upgrade: 2
The EVO 99 platform represents a significant advancement in motorhome suspension technology. The larger 50mm piston allows the shock to handle the same force with less pressure, improving both durability and performance. This is especially beneficial for independent front suspensions with limited shock travel, making the EVO 99 ideal for Freightliner XC chassis with ZF IFS.
Download the SuperSteer 99B-3262 Koni Shock Installation Instructions
A: For front suspension replacement, you need TWO shocks (one for each front wheel). The price shown is per shock, so order a quantity of 2 for a complete front upgrade. If your motorhome also has a steerable ZF tag axle and you want to upgrade those shocks as well, you'll need an additional TWO shocks for the tag axle, bringing your total to 4 shocks. Most customers start with the front suspension upgrade as it provides the most noticeable improvement in ride quality and handling.
A: The EVO 99 features a revolutionary 50mm piston that's 40% larger than the 8805 series (50mm vs 36mm). This larger piston surface area allows the shock to handle the same force with significantly less pressure, which improves both durability and performance. The EVO 99 was originally developed for high-end European motorcoaches and features patented open intake valves, custom valve stacking, and digressive valving optimized specifically for independent front suspensions with limited travel. The result is dramatically reduced vibration and noise, better control in crosswinds and rough conditions, and a limousine-like ride quality that you'll notice immediately. The 9-ton tensile strength construction is also among the strongest in the industry.
A: While experienced DIY mechanics with the proper tools can install these shocks, professional installation is recommended. The installation involves working under a heavy motorhome on suspension components that are critical to your safety. Each shock weighs 11 lbs and requires precise fitment of the stem mounts at both the upper and lower positions. SuperSteer estimates approximately 0.75 hours per pair for experienced technicians. If you're not comfortable working on suspension systems or don't have a proper lift and safety equipment, it's worth having the installation done by a qualified RV service center or SuperSteer certified dealer. Improper installation can affect handling and safety, and may void the warranty.
A: Yes, the 99B-3262 is confirmed compatible with Tiffin Powerglide Allegro Bus models from 2010-Current and Tiffin Powerglide Phaeton models equipped with ZF Independent Front Suspension (IFS). The key requirement is that your coach must have the ZF IFS system - this is the independent front suspension made by ZF. Not all Tiffin coaches use this suspension, so you should verify your chassis specifications before ordering. Check your owner's manual, contact Tiffin customer service, or consult with a SuperSteer dealer if you're unsure whether your coach has ZF IFS. The suspension type is typically indicated on a data plate on the chassis or in your motorhome's documentation.
A: Koni provides a lifetime warranty for the original purchaser on EVO 99 shock absorbers. This demonstrates Koni's confidence in the durability and longevity of their products. The warranty covers defects in materials and workmanship under normal use conditions. Performance parts are subjected to harsh conditions, but with the industry-leading 9-ton tensile strength construction, these shocks are built to handle the demanding environment of RV travel. Keep your purchase receipt and installation records in case you need to make a warranty claim. The warranty is non-transferable and applies only to the original purchaser. For warranty service, contact Koni directly or work through an authorized Koni dealer.
A: Most motorhome owners report a dramatic and immediately noticeable improvement in ride quality after upgrading to Koni EVO 99 shocks. The difference is particularly pronounced if you're replacing worn factory shocks or upgrading from standard RV shocks. You'll notice: significantly reduced body roll when cornering or changing lanes, much better stability in crosswinds and when passing large trucks, smoother ride over bumps and rough pavement, reduced driver fatigue on long trips, less vibration transmitted to the chassis and interior, and improved steering response and control. The manufacturer describes it as transforming "a simple commute into a journey of optimum comfort" - and that's not marketing hyperbole. The EVO 99 technology was developed for luxury European coaches where ride quality expectations are extremely high. Many owners say it's one of the best upgrades they've made to their motorhome.