Need help quick!!!

Hey guys i got home today and when i turned my car off i heard rattling from under neath. thought it was my cat but it is hollowed out almost sounds like a nut in a tin can.
Could it possibly be a bolt from the flywheel?
Is the backing plate removeable or do i have to pull the trans so i know what i'm getting into i need this car by x-mas morning thanks for any help
 
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