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Welcome, I'm Chris (aka Moose), my normal schedule online is around lunch and after dinner past midnight.
What is the idle speed in gear when stopped and its rattling?
Has the vehicle been on a rack and this duplicated so it can be listened to from underneath?
My suggestion is to get it on a rack so you can listen from under the vehicle. Since the noise is gone after 45 mph, I do not suspect a trans issue. I am leaning most towards an exhaust system or component rattling from internal damage or a heat shield or a worn engine or trans mount. Listening to the source with a stethoscope from under the vehicle will provide the best approach for diagnosing this.
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Hello again Chris here,