Hello everyone! I've searched around these forums for the past few days and haven't found anyone with a problem similar to my own. I recently purchased a 1999 two-door tahoe 4wd with Z71 package, 350, and auto 4wd transfer case. It has 174,000 miles and is in pretty good shape.....couldn't pass it up for $800 haha. Anyway, the truck starts runs and drives fine in 2wd. After attempting to use 4wd, I can audibly hear the transfer case shift into 4wd, yet I have no power to the front wheels. When shifting into 4wd low, I hear the transfer case shift as well and it only pulls in 2wd, but low range. My dash lights(push button) all work accordingly, no flashing or crazy stuff, and I already pulled out my actuator from the front diff and verified that it was extending and retracting during the shift into and out of 4wd. My assumptions would indicate a problem in my front diff, but I have yet to drain it to check for metal particles in the oil, and I would think that a major issue in the front diff would have some sort of grinding noises, but there are none. I'd also like to take this time to thank everyone here for the wealth of information among these pages, I sincerely appreciate it .