I have a 2001 Chevy Tahoe, approximately 104,000 miles. The rear transfer case was replaced in March 2010. It had been leaking and when replaced there was a definite pin hole where one of the feet that holds up the oil pump had broken/disintegrated. It was fine for a month of two then the seals started leaking again. It was fixed each time at no charge. The mechanic complained bitterly that the manufacturer had changed the seals that they weren't as good as they used to be.
Now the Transfer case output seal is leaking again. Not a great deal, one drop on the garage floor every two or three nights.
Previous to this Tahoe I owned a 98 Tahoe. The transfer case had been leaking on it for a year or more before I got rid of it. They were never able to figure out where the leak was or to fix it. They said the only way they would be able to fix it was to replace the transfer case.
Is this an issue with Tahoe's or do I just have really bad luck? We only have one place in town that works on the 4X4 stuff outside of the dealerships.