Trans flex plate. Drop the inspection cover and look for metal laying on top of the cover.
If you don't find any metal. Unbolt the converter and slide it back into the bellhousing. Then use a inspection mirror and a flash light and look up around the flex plate mounting bolts. If it is cracked you should see the cracks.
I broke a flex plate on a turbo 350 that was mated to a stock reman 350. It broke from the tires catching traction rather abruptly when I got outa the throttle after a burnout. I didn't know what the sound was and drove on it for a couple months before it broke all the way. I would never do that to a tranny again.
Pictures by 93Green12v - Photobucket I just broke my flex plate and here are some picture's of it and two video's of the noise hope this helps. Don't let it go for long listen to phillip or you'll be walking.
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