Leak at Front Slip Yoke

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2012 GMC Yukon XL, 2012 GMC Yukon, 2012 Chevrolet Tahoe, 2012 Chevrolet Suburban, and 2012 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 Universal Joint Replacement . Replace the oil seal. Refer to one of the following procedures: Rear Output Shaft Seal Replacement for the BW 4485-NR3 transfer case Rear Output Shaft Seal Replacement for the MP 3023/3024-NQH transfer case Transmission Output Shaft Seal Replacement (Four Wheel Drive) for the 6L50/6L80/6L90 automatic transmission Output Shaft Seal Replacement for the 2ML70 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: Rear Output Shaft Seal Replacement for the BW 4485-NR3 transfer case Rear Output Shaft Seal Replacement for the MP 3023/3024-NQH transfer case Transmission Output Shaft Seal Replacement (Four Wheel Drive) for the 6L50/6L80/6L90 automatic transmission Output Shaft Seal Replacement for the 2ML70 automatic transmission