get the car off the ground securely, wheels free to turn, and look at while it's running. try to get it high enough that you can creep under the car. try running through the gears. this should answer some of the questions at least.

buzz at the shifter could be as simple as the shifter bushings bad, but given that you have lost drive it's likely to be related to whatever is causing the loss of drive.

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punkinfair