While driving my 1984 at 65 mph this morning I suddenly developed a very load noise. It sounded like a marble was in one of the cylinders bouncing around. I pulled over and checked the engine, the sound seemed to be coming from the rear of the motor. The engine function seemed ok (no miss or bad running) so I tried to drive it home. The noise immedietly got worse and eventually what ever the problem was caused the engine to die. After towing the truck home I tried to restart. Engine started normally but there was a huge squeal from under the truck. After about three seconds something broke loose and rattled around. Now truck seems to run fine. havent road tested yet but will soon. I am wondering if something in the clutch assemble could have caused the problem. Any suggestions?. keep in mind new long block. new clutch, new bearings about 2000 miles ago.