OE Replacement Number: Internal Shallow Filter: 29537965.External Spin on Filter: 29539579. Fits Light Duty trucks 2001-2010 5 & 6.6L speed Allison 1000 Transmission 【Compatible】Compatible with 6.6L Duramax with Allison 1000 2000 Transmission.Fit for Chevy Vehicles: 2007-2010 Silverado 3500 HD; 2001-2010 Silverado 2500 HD.Fit for GMC Vehicles: 2007-2010 Sierra 3500 HD; 2001-2010 Sierra 2500 HD 【Function】The 29537965 Transmission Filter Kit Fit is Made of High-Quality Materials,Which can Filter the Oil,Remove the Impurities,Keep the Oil Clean,Prevent the Valve Body and Other Parts of the Blockage,Which can Effectively Extend the Service Life of the Gearbox. 【Durable Construction】This transmission filter is built to last with high-quality materials that can handle high temperatures and tough conditions. It's designed for Allison transmissions with shallow oil pans, ensuring a perfect fit and leak-free seal. You'll get reliable, efficient performance in all driving conditions. 【Easy Installation】This spin-on full-flow transmission filte Precision-engineered to OEM specifications for quick and hassle-free installation, making it an excellent choice for Chevy Silverado, GMC Sierra, and other vehicles with Allison transmissions r comes with a steel canister and paper element Comprehensive Transmission Protection – This filter kit is designed for Allison 1000 and 2000 Series transmissions, offering both internal and external filtration to effectively capture contaminants and extend transmission lifespan