I am running the Griggs Racing suspension with torque arm and Watts link that the previous owner had on my 07 GT500. I am also running a Drive Shaft Shop one piece aluminum drive shaft and I get a little vibrating coming in at higher speeds. like 100 mph+. Just wondering if there is any pinion angle adjusting that needs to be done or what other things it could be. The car had a DSS two piece shaft on it when I got it and It sat so low I couldn't get into my driveway and after raising my coil overs up a bit the two piece shaft was too short so I decided to upgrade to the one piece.