This Litens Serpentine Belt Drive Component Kit fits 1999-2009 Cadillac Escalade / Chev Avalanche, Express, Silverado, Suburban, Tahoe / GMC Savana, Sierra, Yukon w/4.8/5.3/6.0/6.2L (AC Drive). These kits make it easy to maintain your entire front end accessory drive system. Eliminate the need to search for individual parts by purchasing this all-in-one solution. Front end accessory drives require maintenance at specific intervals, and parts should be replaced as part of your regularly scheduled tune-up to ensure your vehicle is at its best. This kit contains a Litens belt tensioner and a Bando serpentine belt. All required hardware is included for the installation . Application specific instructions are also conveniently included. The tensioner in this kit has an improved design with a premium bearing, improved corrosion resistance, and an increase in belt tension which will lead to less noise and slip. These features were not available on the original part. All parts meet or exceed OE fit, function, and performance.