It doesn't sound like CV joint, bearing or any of that, I'd be looking at a mounting affected by shifting weight.
Engine, wishbone, anti roll bar, exhaust etc.
Can you feel it, or just hear it?
If you can feel it, then try to recreate it in different gears at higher speeds, since it may just be that it is drowned out by other noise.
If it is only first gear, then that may be related to the fact that the engine may move more because of the impact of the gearing of first.
You probably would not be able to recreate that force when standing still by heaving and pushing.
If it is as slow as 5mph, can you not trot by the car while someone else drives? Perhaps on a bicycle? (right location time be safe blah blah H&S) Perhaps you could at least work out if it was one side or the other.
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