This is a Transfer Case Gasket and Seal Kit for the GM/Chevy New Process 261 or 263 transfer case for years 1999-on. NP261 or NP263 Transfer Case Gasket and Seal Kit This kit comes with the seals and the adapter gasket. This Transfer Case is Aluminum and Chain Driven Only. This gasket and seal kit will ONLY work for the NP261 and NP263 it will not work for the XHD Diesel Version that is a different seal kit that we do carry please see our store.