Extension Housing Rear Oil Seal (4L80-E): Installation
WARNING: This page does not describe the selected car, but rather 13 other vehicles, including the 2002 GMC Yukon XL, 2002 GMC Yukon, 2002 GMC Sierra, 2002 GMC Cab & Chassis Sierra, and 2002 GMC C3500 HD. However, it is still accessible from the selected car via links, so may be relevant.
Lubricate the inside diameter of the new seal with assembly lubricant. Use the output shaft seal installer with a soft faced mallet to install the seal. See Fig 2. Install the seal to the extension housing. Install the propeller shaft. See REMOVAL & INSTALLATION in appropriate DRIVE SHAFTS & UNIVERSAL JOINTS article in DRIVE AXLES. Remove the drain pan and lower the vehicle. Fill transmission with appropriate fluid to proper level. See LUBRICATION .