Case Extension and Gasket Replacement (6L80)

WARNING: This page is about a different car, the 2009 Cadillac STS. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: View Of Case Extension Housing Assembly & Bolts

Courtesy of GENERAL MOTORS CORP.

Callout	Component Name
NOTE: The extension housing and drive shaft flange (yolk) on this vehicle are serviced as a complete assembly. The drive shaft flange seal is a dust shield used to protect the sealed drive shaft flange bearing that is pressed into the extension housing. The drive shaft flange is pressed into the drive shaft flange bearing, and is not serviceable. The extension housing should NOT contain any transmission fluid. If transmission fluid is present in the extension housing, replacement of the output shaft seal is necessary. Refer to Transmission Output Shaft Seal Replacement (6L50 All Wheel Drive) or Transmission Output Shaft Seal Replacement (6L50 Rear Wheel Drive) or Transmission Output Shaft Seal Replacement (6L80) . Preliminary Procedures Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle . Remove the exhaust system. Refer to Exhaust System Replacement . Remove the drive shaft. Refer to Rear Propeller Shaft Replacement (AWD) or Rear Propeller Shaft Replacement (RWD) . Support the transmission with a suitable jack. Remove the transmission mount assembly. Refer to Transmission Mount Replacement (All Wheel Drive) or Transmission Mount Replacement (Rear Wheel Drive) .
1	Case Extension Housing Bolt (Qty: 6) CAUTION: Refer to Fastener Caution . Tighten: 50 N.m (37 lb ft)
2	Case Extension Housing Assembly Tip Serviced as a complete assembly as shown. There is no gasket or seal between the extension housing and transmission case.

Callout

Component Name

NOTE: The extension housing and drive shaft flange (yolk) on this vehicle are serviced as a complete assembly. The drive shaft flange seal is a dust shield used to protect the sealed drive shaft flange bearing that is pressed into the extension housing. The drive shaft flange is pressed into the drive shaft flange bearing, and is not serviceable. The extension housing should NOT contain any transmission fluid. If transmission fluid is present in the extension housing, replacement of the output shaft seal is necessary. Refer to Transmission Output Shaft Seal Replacement (6L50 All Wheel Drive) or Transmission Output Shaft Seal Replacement (6L50 Rear Wheel Drive) or Transmission Output Shaft Seal Replacement (6L80) .

Preliminary Procedures

Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle .
Remove the exhaust system. Refer to Exhaust System Replacement .
Remove the drive shaft. Refer to Rear Propeller Shaft Replacement (AWD) or Rear Propeller Shaft Replacement (RWD) .
Support the transmission with a suitable jack.
Remove the transmission mount assembly. Refer to Transmission Mount Replacement (All Wheel Drive) or Transmission Mount Replacement (Rear Wheel Drive) .

Case Extension Housing Bolt (Qty: 6)

CAUTION: Refer to Fastener Caution .

Tighten: 50 N.m (37 lb ft)

Case Extension Housing Assembly

Tip

Serviced as a complete assembly as shown.
There is no gasket or seal between the extension housing and transmission case.