Put the transfer case in neutral and the tranny in gear. You do not want the transmission output shaft turning for a long distance as there is no lubrication for the small bearing in between the input shaft and the output shaft. The lube comes from the input shaft, which can't splash oil if the engine is not running.
Along with the A frame and lights, you shoudl also have a safety chain between the two vehicles, and hooked up in such a way that if the tow bar lets loose, the towed vehicle will be pulled towards the ditch rather than the center of the road.
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