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How frequent is the sound? My guess would be torque converter, or differential, though im leanning towards the diff. I doubt u-joints are the problem. From your description, the noise doesn't happen very frequently at low speeds. Your driveshaft is spinning at 3-4 times faster than your tires, so even at low speeds, the noise would be pretty frequent. "every few seconds" sounds like a lot slower than you would get from a driveshaft. It sounds like once per revolution of the tires, and at those speeds your pretty much limited to a rear-end problem. take off the inspection plate sometime and take a look at it.
ooh, an idea. Put the car in neutral and then move it slowly and see what happens. See if it makes it at a stop, and see if it makes it when moving. In neutral, the TC will be spinning, without you moving. If it makes this noise, or a difference in rpm or something, its prolly the TC. If it doesn't make it till moving, then its somewhere either IN the tranny, or behind it at the diff.
I have something similar to that on my jeep, but nowhere near as intense. One of the bearing in the rearend is shot ( i cant remember...i think it was the side bearing in the diff). As i rotate the tires, resistance increases noticably at one point. Then all of a sudden it releases pressure and is fine till i rotate it around again. You could have a similar problem. Just a thought, i could be way off base.
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