I have a 1987 mustang with a t5 in it. The car is a street strip car and I noticed the other day while going down the highway that I am getting a decent amount of vibration through my drivetrain when I have the clutch released but goes away once I push it in. This happens more at speeds above 20mph and I dont notice it a whole lot below 20mph. Any ideas on what could be causing the issue? Im thinking input bearing maybe but not too sure.