Ive had my car to two well known performance shops for a roar it gets at 80ish mph and no one can find it. When Im at 80 and I push the clutch in and free roll the car gets this roar with some vibration that comes in from what sounds like around the tranny. So far we've done clutch, throwout bearing, pilot bearing, driveshaft, balanced driveshaft, U joints, rear gear, and rear bearings. They also checked input shaft and tailshaft today and nothings changed a thing. The shops opening the tranny now to check some clearences in it but if thats ok we are getting out of ideas. Any help would be great.