Drive Line Grinding Noise

[djseed]

I am the original owner of SPO1630. It was purchased new in 2003 and uses a 460 stroker. I now have 5,400 miles on the car. From the day I picked the car up at Legendary Motorcars there has been an intermittant grinding or rattling noise coming from the back end of the car. When I took the car for the final drive at Legendary, they told me about the strange noise. As I was driving home I heard the noise and stopped the car and looked under the back end. Nothing was visible. Since that time the car was back to Macro Autosports Canada for regular work and all upgrades that were available until 2007. (Macro was put out of business by Transport Canada about that time) Macro was unable to resolve the problem. It has been in the shop to get the shock tower kit from Performance Unlimited and nothing was out of alignment or loose. In about 2010 I called Len Scok the former owner of Macro. He was nice enough to return my call even though the car is long out of warranty. He told me again that every update from the factory was put on my car. The only thing he said was that the driveshaft is so short with a 460 that the angle to the rear end is extreme and it is probably the U Joints rattling. It does sound like U joints rattling and this may be the problem although the U Joints are not worn or loose. Does anyone have any thoughts or suggestions on how to resolve this issue?