A friend of mine did a clutch job before selling me a car. two weeks later, I heard this horrible grinding soun, followed by clunking. turns out, he lost one of the bellhousing bolts, but never bothered to look for it, it's only a 4 cyl mustang. I had to go over a bump for the flywheel to hit it lying under the flywheel and start smashing it around..... I thought I lost the tranny