Ford AOD is not flat towable more than a few miles at low speed. Most rear wheel drive automatics are this way. There are drive line disconnects available in the RV industry to disconnect the transmission. A lot of 4WD vehicles have a neutral in the transfer case that serves the same purpose.
RWD manual transmissions are not flat towable, either. No lube to the mainshaft when towed because the counter shaft is not spinning, so the speed gears will seize to the mainshaft. FWD manuals can usually be flat towed because the final drive provides oil splash.
There are exceptions to the automatics, though. The GM 4T40 and 4T45E can be flat towed, they were designed with this in mind. They have a final drive driven lube pump. These transmissions were was the HHR was so popular behind RVs. It also came in some Cavaliers/Sunfires, Malibu/Grand Am/G6, and Cobalt/G5.
There also electric lube pumps available in the RV world to provide lube pressure, making normally not towable transmission towable.
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Today's Featured Article - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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