GM Service Manual Online
For 1990-2009 cars only
Makes
🢒
GMC_Truck
🢒
1999
🢒
Envoy - 4WD
🢒
Transmission/Transaxle
🢒
Automatic Transmission - 4L60-E
🢒 Extension Housing Rear Oil Seal
Tools Required
J 21426
Rear Extension Seal Installer
Removal Procedure
Raise the vehicle. Refer to
Lifting and Jacking the Vehicle
in General Information.
Remove the propeller shaft. Refer to
One-Piece Propeller Shaft Replacement
or to
Two-Piece Propeller Shaft Replacement
in Propeller Shaft.
Remove the rear extension oil seal.
Installation Procedure
Install the new seal using
J 21426
.
Install the propeller shaft. Refer to
One-Piece Propeller Shaft Replacement
or to
Two-Piece Propeller Shaft Replacement
.
Lower the vehicle.
Inspect the transmission fluid level. Refer to
Fluid Capacity
.
Use Dexron® III Automatic Transmission Fluid.