All great suggestions guys. Thanks for the replies. I'm inclined to think it is the driveline as well. Scott, you mentioned the possibility of not putting the driveline together in the correct phase. What do you mean by that? By the way, I did have the truck jacked and resting on the rear axle as mentioned when I watched for something out of round as the driveline turned. I really don't think it is an issue with the tires and wheels in this case. I have some time to try to work through this. Any other ideas out there while we're on the topic? Thanks to all.
