The Timken 714654 is a manual transmission output shaft seal, also sold as National NA714654. Designed to seal the output shaft on manual transmissions, this seal is the correct replacement for Chevrolet Silverado 2500 applications per available fitment data. The seal measures 3.25 in. outer diameter by 0.875 in. width. If you need to confirm this part fits your specific transmission or vehicle configuration, call Pro Gear and Transmission and we can help verify the application before you order.FeaturesManual transmission output shaft sealTimken part number 714654, also cross-referenced as National NA714654Outer diameter: 3.25 in., width: 0.875 in.Fitment reference: Chevrolet Silverado 2500 manual transmission applicationsSold individually (each)Tech SpecsPart Number: 714654Cross-Reference: National NA714654Type: Manual Transmission Output Shaft SealOuter Diameter: 3.25 in.Width: 0.875 in.Application Reference: Chevrolet Silverado 2500Sold As: Each