I took the rear driveshaft to local shop and had the balance checked and it is OK. The vibration is much better with the rear shaft removed but not perfect. I really don't know what I'm going to do with it next but it is annoying to drive on the interstate so it mostly just sits in the garage. I drive it around town once in a while and that's it. We were planning on a trip to Colorado and Moab next summer but there's no way I'll drive the miserable thing from Ohio out there!That would be nice, but I've noticed the thrumming when coasting in neutral, at idle.