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Thanks for posting,
The rattle noise is most likely coming from an exhaust component, possibly an exhaust heat shield or a loos e baffle in the catalytic converter or there may be contact between the exhaust system and the frame. The clunk can be caused by loose transmission crossmember bolts or a cracked crossmember, this used to be common on these Tundras and I believe there was a service bulletin to replace the crossmember.