Leak at Front Slip Yoke

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2007 GMC Yukon XL, 2007 GMC Yukon, 2007 Chevrolet Tahoe, 2007 Chevrolet Suburban, and 2007 Chevrolet Avalanche. 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 Rear Propeller Shaft Replacement . Replace the oil seal. Refer to one of the following procedures: Transfer Case Output Shaft Seal Replacement - Rear for the BW 4485-NR3 transfer case Transfer Case Output Shaft Seal Replacement - Rear for the NVG 246-NP8 transfer case Transmission Extension Housing Rear Oil Seal Replacement for the 4L60-E automatic transmission
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: Transfer Case Output Shaft Seal Replacement - Rear for the BW 4485-NR3 transfer case Transfer Case Output Shaft Seal Replacement - Rear for the NVG 246-NP8 transfer case Transmission Extension Housing Rear Oil Seal Replacement for the 4L60-E automatic transmission