Transfer Case Assembly 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 Assembly & Seal

Courtesy of GENERAL MOTORS COMPANY

Callout	Component Name
Preliminary Procedures Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle . Remove the transfer case shield, if equipped. Refer to Transfer Case Shield Replacement . Remove the rear propeller shaft. Refer to Rear Propeller Shaft Replacement (1500)Rear Propeller Shaft Replacement (Heavy Duty)Rear Propeller Shaft Replacement (M5U, 2WD) . Remove the front propeller shaft. Refer to Front Axle Propeller Shaft Replacement (NQH)Front Axle Propeller Shaft Replacement (Heavy Duty) . Drain the fluid from the transfer case. Refer to Transfer Case Fluid Replacement . Disconnect the electrical connectors and remove the electrical harness from the transfer case. Disconnect the vent hose at the transfer case. Remove the crossmember. Refer to Transmission Support Crossmember Replacement (2 WD)Transmission Support Crossmember Replacement (4 WD) . Remove the transmission mount. Refer to Transmission Mount Replacement (Two Wheel Drive)Transmission Mount Replacement (Four Wheel Drive) for the 6L45/6L50/6L80/6L90 transmission.
1	Transfer Case Nut (Qty: 6) CAUTION: Refer to Fastener Caution . Tighten 50 N.m (37 lb ft)
2	Transfer Case Procedure If installing a new or repaired transfer case, perform the Transfer Case High/Low Clutch reset. Refer to Transfer Case High/Low Clutch Reset . Transfer parts as necessary.
3	Transfer Case Gasket Procedure Install a NEW gasket without the use of any type of sealant or lubricant. Apply lubricant meeting GM Specification 9985830 to the input shaft splines. Refer to Adhesives, Fluids, Lubricants and Sealers .