it is a constant noise? does it happen more or less as you get on and off teh gas? does it hit going over bumps?
a lot of the thumping noises that come from under there are from broken transmission and torque arm mounts. just get under the car and push on torque arm. if the trans goes back and forth as you push the tranny mount is busted, if the torque arm moves and the trasn stays still the torque arm bushing is busted.
it is fairly common to also damage the motor mount bushings if the trans mount has been messed up for an extended period of time.
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