First, I'm sorry for all the questions. If I could actually hear it, it would make things much easier. However, I'm most likely a thousand miles from you.
Based on your description, I need you to check a few things. Start with the universal joints. Also, check to see if there is any play in the pinion bearing (rear of the driveshaft where it connects to the differential).
Let me know what you find.
Monday, August 9th, 2010 AT 12:51 AM