after getting the 67 stang up and running for the first time i got a bad vibration at a certain speed comes on at around 45mph goes away at around 50+.After a few checks tyres/wheels etc i turned to the driveshaft to my horror someone has actually cut and shut the tube either to shorten it or lengthen it using another tube end the weld is in the middle of the tube.So a new re-tube is in order