This is a hard problem to describe, I know, and I will toss out a few possibilities. If the noise occurs when the car is accelerating, it can be motor mounts, or carriage mounts on front-wheel drive vehicles. Transmissions can bang into gear. Drive shaft u-joints can bang before they fail. C-V joints in front wheel or 4 wheel drive units can bang when worn out.
The exhaust system can break loose and bang on the frame. Brake calipers can rock in their mounts and transmit sound. Tie-rod ends can make a knocking noise on every bump you hit. There were recalls on gas tank straps for some Ford made units, so a loose gas tank can bang.
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