Road Warrior Shifter Isolator Bushing Kit For Eaton Fuller Heavy Rigs Replacement Fits Freightliner Kenworth Peterbilt Mack Volvo K3399 MS99-63399 Smooth Shifting Upgrade For Long Haul Days

Eaton Fuller Shifter Bushing Kit for Heavy Rigs Smooth Gear
✔️ MS99-63399 Fits K3399 Includes Bolt Nut Washers Metal Rubber

This shifter isolator bushing kit serves as a direct replacement for worn OE parts on Eaton Fuller transmissions common in Freightliner, Kenworth, and Volvo Class 8 rigs. The complete hardware set restores crisp gear selection by absorbing harmful vibrations and wiping out shift tower slop. Truckers install this kit to quiet the cab, stop gear grind, and maintain precise control during heavy hauling duty.

✅Steel construction with tough rubber inserts offers strong vibration isolation and durability
✅Ready to install with two step bushings, washers, shoulder bolt, and lock nut included
✅Direct fit for MS99-63399 and K3399 specifications across major heavy-duty transmission models
✅Red coated surface resists corrosion and moisture for longer service life on commercial trucks

💡What accelerates degradation of elastomeric materials in heavy truck shifter isolator mounts?

Kinetic stress and thermal cycling breakdown the rubber compound inside the transmission shift tower over thousands of miles. When the isolator fails, metal-to-metal contact introduces slop and vibration that ruins shift feel and increases cabin noise. Swapping in a hardened bushing kit brings back precise lever movement and shields critical linkages from impact damage.

Making this repair handy ensures your shifter stays responsive under pressure:

- Engineered steel and synthetic rubber layers resist fluid attack and temperature swings without cracking.

- Locks down lateral and vertical shaft motion to eliminate the risk of gear clash during hard acceleration.

- Dampens harmonic frequencies from the powertrain to reduce fatigue-inducing noise in the operator station.

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