Dorman 635-518 Rear Main Seal Kit 4.8 5.3 6.0 6.2 Chevy GMC 12633579 12639250

Note- To ensure a leak-free installation, the use of the Dorman 635-000 installation tool or its equivalent is required. Failure to do so will result in a bad seal, and cause leaks. Failure to do so will void the warranty.