I have a 91 GT 5 speed. Recently it started making a slight scraping sound from the drivetrain only at low rpms in 1st and 2nd Gear. At first I thought it was my driveshaft scraping my mufflers but I checked the clearance and everyting was OK. I don't think its a transmission problem--the car never grinds a gear or anything--but who knows? Is there something else my driveshaft could be hitting? (It also makes this scraping noise from the transmission area whenever I hit bumps in the road). What could this be?