I had a '65 GTO for awhile back in the mid '70s, had a nice built 69 400 motor, Hays steel flywheel (40 lb), Lakewood bell housing, Muncie M-22, 4.10s ..... and one night it was fine in 1-2 and ok in 2-3 and when I pulled 4th, rpms shot up and I let off and realized clutch was gone ..... we drifted into a p-lot. Towed home, pulled clutch next afternoon ..... what was a near new Zoom looked a lot like that.