Case Extension And Gasket Replacement

WARNING: This page is about a different car, the 2018 GMC Yukon XL, 2018 GMC Yukon, 2018 Chevrolet Tahoe, 2018 Chevrolet Suburban 3500 HD, and 2018 Chevrolet Suburban. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Case Extension And Gasket

Courtesy of GENERAL MOTORS COMPANY

Callout	Component Name
Preliminary Procedures Remove the propeller shaft. Refer to Rear Propeller Shaft Replacement (1500)Rear Propeller Shaft Replacement (Heavy Duty)Rear Propeller Shaft Replacement (M5U, 2WD) . Remove the transmission mount. Refer to Transmission Mount Replacement (Two Wheel Drive) Transmission Mount Replacement (Four Wheel Drive) .
1	Extension Case Fastener (Qty: 6) CAUTION: Refer to Fastener Caution . Tighten 55 N.m (41 lb ft)
2	Extension Case NOTE: Remove or replace the O-ring, if necessary.

Callout

Component Name

Preliminary Procedures

Remove the propeller shaft. Refer to Rear Propeller Shaft Replacement (1500)Rear Propeller Shaft Replacement (Heavy Duty)Rear Propeller Shaft Replacement (M5U, 2WD) .
Remove the transmission mount. Refer to Transmission Mount Replacement (Two Wheel Drive) Transmission Mount Replacement (Four Wheel Drive) .

Extension Case Fastener (Qty: 6)

CAUTION:

Refer to Fastener Caution .

Tighten
55 N.m (41 lb ft)

Extension Case

NOTE:

Remove or replace the O-ring, if necessary.