The MOOG K6535HD Heavy Duty Idler Arm is a direct replacement for your 2001-2010 GM 6.6L Duramax. MOOG Idler Arms have an internal wear take-up spring that absorbs shock and vibration for smoother, safer movement and maximum durability. A patented pressed-in cover plate eliminates excessive play and allows for tighter tolerances. These idler arms use powdered-metal gusher bearings with grease grooves to improve performance and service life. This approach allows grease to flow through the bearing to the stud and provides a smooth, durable surface that extends service life. Moog idler arms also use a double-tapered bearing design that decreases deflection and helps preserve proper toe setting, and they have a larger bearing surface area that distributes the load more evenly.