The only symptom I had of this problem was a strange squeak in reverse, and forwards (but only with the gear engaged and not giving it gas). The squeak was not continues, but rhythmic faster than the wheel speed. So I determined it had to be the driveshaft, with some help from some friends and /r/auto.
Once concluded it was the driveshaft, I there were three parts it could be: front guibo (rubber disc connection shaft and trans), center bearing, and one of the rear U-joints. Pelican parts has some good guides on this also, with some pics. I was too busy WORKING to take pictures, so fuck off.
Sequential steps.
If there, remove X - frame from under the engine. Should be 6 bolts. It's much harder to remove the exhaust (impossible) with this here. Of course I didn't notice it until I had undone all the bolts. Learn from my mistakes, at least somebody should.
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Remove the heat shield : a few easy bolts here and there, plus a clip securing the oxygen sensor cable to the heat shield.
Guibo : towards the front. It's only absolutely necessary to remove 3/6 bolts to remove it. I recommend removing the ones holding the guibo to the transmission, however this might make the shaft harder to remove. I say might, because I removed all 6. Removing every one after the first entails being able to turn the shaft, which can be a pain,
YMMV. Use the crescent wrench to hold the nut in place while you turn the bolt with the ratchet.
Rear U-Joint: four bolts at the very back. 15mm. Once removed, sustain the shaft with wire, or a stand; just keep the weight off it.
Center bearing: two bolts, 13 mm (probably).
Note: you should be done here, if the shaft seems somewhat stuck on the transmission just pull back on it.
Note 2: the shaft separates into 2, might make removal easier.