GM 12547638
Output Shaft Seal, Rear

The replacement process of the rear transfer case output shaft seal requires shields to be eliminated first if they exist as well as subsequent removal of the rear propeller shaft. Start by taking off the rear output shaft seal before examining the bushing of the rear output shaft for any damage or wear. You can use the transfer case rear bushing remover and installer (J 45380) to remove the rear output shaft bushing by placing its finger section ahead of the bushing then attaching tools before loosening the bushing with a wrench. The tool called transfer case rear bushing remover and installer (J 45380) should be used for installing the new output shaft bushing through a process where the tool and bushing align with the case while using a hammer to perform the installation step until the drain hole on the rear output shaft seal boot faces downward. To complete the repair process, employ the seal installer (J 37668-A) to put in a fresh front output shaft seal and then install the rear propeller shaft before inspecting and adding more fluid when needed and replacing the transfer case shield if applicable.

Initially raise the vehicle to access the rear transfer case output shaft seal installing and safely remove the rear propeller shaft before attending to the transfer case sealing surfaces or shafts. The next step is to eliminate the transfer case rear output shaft seal before performing an examination of the rear output shaft seal bushing for wear and scoring. You can use the j 45380 transfer case rear bushing remover and installer to extract the rear output shaft bushing by inserting its finger section in front before the bushing then attaching the tube and forcing screw before removing the bushing with a wrench. The installer (J 45380) serves installation of the new rear output shaft bushing by correctly positioning it so the drain hole on the rear output shaft seal boot points downward. The seal installer tool j 37668-a allows you to install the transfer case rear output shaft seal then reinstall the rear propeller shaft followed by fluid level check then vehicle lowering.

Vehicle elevation serves as a first step before starting Transfer Case input shaft seal replacement work. After lifting the vehicle begin by removing the Transfer Case from its position followed by removing the Transfer Case input shaft seal. When installing the new input shaft seal position the part numbers to be visible toward the technician. After installation position the Transfer Case input shaft seal perfectly straight along the input shaft and verify its evenness with the Transfer Case surface. The j 42738 seal installer (J 42738) serves to properly install the Transfer Case input shaft seal. Reinstall the Transfer Case into the vehicle before checking fluid levels followed by vehicle lowering.

Use a flat-tipped screwdriver to remove the input shaft seal.

The drain hole should be facing down toward the ground.

Use the J 42738 Seal Installer to install the transfer case input shaft seal.

Reinstall the rear propeller shaft.

The transfer case front output shaft dust seal and the front output shaft seal.

Remove the rear output shaft seal and inspect the rear output shaft bushing for any scoring or wear.

Remove the transfer case shield if equipped, followed by the rear propeller shaft.

Reinstall the rear propeller shaft.

First, raise the vehicle and remove the transfer case shield and the rear propeller shaft.

Remove the transfer case shield and the front propeller shaft from the transfer case.

Raise the vehicle.

Use J 45380 for light duty or DT-48734 for heavy duty.

The transfer case shields.

Remove the transfer case shield if equipped and the front propeller shaft.

The Front Output Shaft Seal Protector (J 44636-2).

J 43484 Front Output Shaft Seal Installer (midyear 1999 and later seal) and J 35870 Front Output Shaft Seal Installer (start of production to midyear 1999 seal).

Ensure that the part numbers on the seal face outward toward the technician and that the seal is even with the surface of the transfer case upon installation.

Position the new seal on the input shaft, ensuring that the part numbers on the seal are facing outward toward the technician.

Ensure the seal is positioned straight.

The front propeller shaft and the exhaust crossover pipe.

The rear output shaft seal can be removed by prying it out with a flat-tipped screwdriver.

Install the front output shaft seal onto the protector using the Front Output Shaft Seal Installer (J 44636-1).

First, raise the vehicle.

Reinstall the transfer case front output shaft dust seal, the front propeller shaft, check the transfer case fluid level, and reattach the transfer case shield before lowering the vehicle.

Check the transfer case fluid level, reinstall the transfer case shield, and lower the vehicle.

First, remove the transfer case.

A sharp punch may be necessary to poke a hole in the seal.

Reattach the rear propeller shaft to the transfer case, check the transfer case fluid level, and finally reinstall the transfer case shield before lowering the vehicle.

Remove the rear output shaft seal and inspect the rear output shaft bushing for any scoring or wear.

Insert a flat-tipped screwdriver or small pry bar between the outer race of the seal and the transfer case to remove the outer part of the seal.