Input Shaft Seal Replacement

WARNING: This page is about a different car, the 2018 GMC Yukon XL, 2018 GMC Yukon, 2018 Chevrolet Tahoe, and 2018 Chevrolet Suburban. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: View Of Transfer Case, Nut & Input Shaft Seal

Courtesy of GENERAL MOTORS COMPANY

Callout	Component Name
CAUTION: Do not damage the sealing surfaces of the transfer cases or the shafts when prying the seals for removal. Damaging the sealing surface may cause leakage or require replacement of the damaged component. Preliminary Procedure Remove the transfer case. Refer to Transfer Case Assembly Replacement .
1	Transfer Case Nut Procedure Use transfer case nuts to secure transfer case to assembly fixture J-45759 assembly fixture. Special Tools J-45759 Assembly Fixture For equivalent regional tools, refer to Special Tools .
2	Transfer Case Procedure Insert the transfer case and assembly fixture into the bench holding fixture J-3289-20 holding fixture and secure with pivot pin. Special Tools J-3289-20 Holding Fixture For equivalent regional tools, refer to Special Tools .
3	Transfer Case Input Shaft Seal Procedure Remove the seal using an appropriate tool. Refer to Transfer Case Disassemble . Install the seal using J 42738 seal installer. NOTE: Ensure the bore of the front case half is free of dirt, oil, and cleaning solvent. Double lip input shaft oil seals are used on applications with a WET adapter cavity. Single lip input shaft oil seals are used on applications with a DRY adapter cavity and with 6 speed transmission and are to be installed with the spring portion of the seal facing inward towards the internals of the transfer case. Special Tools J-42738 Seal Installer For equivalent regional tools, refer to Special Tools .