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I'm looking for a towed vehicle (toad for RVers) for a motorhome. Why not make it an f100? I have a line on a 66 F100 with a straight 6 and 3-on-the-tree. Would this manual transmission let me tow it 4 wheels down? It would need to have the oil slinger inside the transmission to be on the output shaft. If it is on the input shaft (which would not be turning in neutral towing down the road) the transmission would be damaged. I bought a Mazda 6 with a 5 speed a few years ago just for this and now have found it can't be towed without a tow dolly.
I've found that your best bet for flat towing any vehicle when you're not sure of it's towable status is to disconnect the driveline from the differential and wire it to the frame. In the case of our three piece axles, you can simply remove the last section(about 10 minutes). I like to protect the grease in the slip joint with a Baggy or Seran wrap to keep the grit away while it is off.
This also reduces the drag on the tow vehicle slightly. It won't make any difference really on short tows but if you are snow birding from cold climates to Arizona every winter then the savings can be noticeable.
There are also some manual lockout kits which put a locking hubs on the rear end. just a twist of the **** and your wheels are completely disconnected from the power train. These reduce drag even further but it is not a cheap way to go since you have to convert your axle to full floater in order to do this.
I've heard this one and it is doable. One of the reasons for getting out of a 5th wheel and going to a motorhome is doing away with as much set up/tear down as possible when camping. Adding the task of climbing under a truck to hook up/unhook the drive-shaft is a big step. Not to say what highway patrol would say when getting ticketed for "failure to maintain control of drive-shaft" as they pull it out of someones windshield.