Leak at Front Slip Yoke

WARNING: This page is about a different car, the 2007 GMC Sierra and 2007 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.

Checks	Action
DEFINITION: A few drops of lubricant that are leaking from the splined yoke are normal. This condition does not require attention.
The slip yoke barrel is burred, nicked, corroded, or worn.	Inspect the slip yoke for burrs. Careful use of crocus cloth or fine stone honing can remove minor burrs. If the yoke is badly burred, corroded, or worn, replace the yoke. Refer to one of the following procedures: For vehicles equipped with a one piece propeller shaft, refer to One-Piece Propeller Shaft Replacement . For vehicles equipped with a two piece propeller shaft, refer to Two-Piece Propeller Shaft Replacement . Replace the oil seal. Refer to one of the following procedures: For vehicles equipped with the MP 1222/1225/1226-NQG transfer case, refer to Transfer Case Assembly Replacement . For vehicles equipped with the MP 1625/1626-NQF transfer case, refer to Transfer Case Assembly Replacement . For vehicles equipped with the MP 3023/3024-NQH transfer case, refer to Transfer Case Assembly Replacement .
There is a faulty oil seal in the transmission or in the transfer case output shaft.	Replace the oil seal. Refer to one of the following procedures: For vehicles equipped with the MP 1222/1225/1226-NQG transfer case, refer to Front Output Shaft Seal Replacement . For vehicles equipped with the MP 1625/1626-NQF transfer case, refer to Vehicle Speed Sensor Replacement . For vehicles equipped with the MP 3023/3024-NQH transfer case, refer to Front Output Shaft Seal Replacement . For vehicles equipped with the 6L50/6L80/6L90 transmission, refer to Case Extension and Gasket Replacement . For vehicles equipped with the Allison transmission, refer to Rear Propshaft Shaft Seal Replacement .