This is a Transfer Case Gasket and Seal kit for the GMC K3500 BW4470 Transfer Case This is a Gasket and Seal kit for a 1989-On GM Borg Warner 4470 Transfer Case. GMC K3500 This is for an Aluminum Case, Cast "44-01" or "4470" and has a center plate between the cases. This kit comes with the seals, o-rings and adaptor gasket.