If you haven't yet replaced/rebuilt it you are going to be buying a new tranny and front shaft when it fails and they don't always send up a little red flag saying the are about to die.
Replace it "TODAY" or plan on a huge expenses when it fails.
How mechanical are you?
By the way, my first one failed at around 27,000 miles, luckily I caught it before it punched a hole in my tranny.