National 4577 is an automatic transmission torque converter seal listed for Buick Lucerne. It is part of the transmission sealing group and is sold each. A torque converter seal sits at the transmission front, where the converter hub enters the case, and holds transmission fluid in. This is a genuine National part from Pro Gear and Transmission, and our parts staff can help you match it to your application.FeaturesNational automatic transmission torque converter seal, part number 4577Listed for Buick LucerneTransmission sealing partSold eachA genuine National part from Pro Gear and TransmissionTech SpecsBrand: NationalPart number: 4577Type: Automatic Transmission Torque Converter SealUnit of measure: Each