No more convoluted than most. The OP asked about flat towing, stating (in post #2) that the driveshaft would be pulled. Then jbwheels asked about pulling the axles instead of the driveshaft so that separate question was addressed.

And to your earlier post, yes, everything else in the axle is spinning and there's no issue... if the axle shafts were not pulled. But my post was addressing what if you pull the axle shafts.

What we're all saying is "don't pull the axle shafts."

 

 

Well then I stand corrected.
$1000 total may not be out of line for a worthwhile project.
A buddy of mine drove one home a couple of hundred miles for $750. RV was gutted except the driver cockpit area but the 460 ran great.

 

Flat tow is dangerous, a friend had both of his vehicles damaged when a blowout on the towed vehicle caused it to come around and contact the one pulling.

 

I've 'flat towed' (on four wheels, with a towbar) a lot of vehicles thousands of miles (Air-cooled VW's, Toyota Mr2 5spd, Suzuki Samurai 5spd). Nothing with an automatic, but everything I've read says to not tow with an auto more than 45mph across town, because of the internal oil pump not being backdriven by the output shaft, needing the engine to turn in order to pump oil to the spinning internal parts.

Leaking oil: I'm not certain about the Ford C6 automatic, but with a non-flanged output shaft transmission used on most early American V8's, once you remove the driveshaft from the transmission's tailshaft housing (the driveshaft just slides out), the tailshaft leaks transmission fluid.

Something to check out before flat towing.

 

Not to quibble but the speed a flat-towed automatic transmission isn't an issue--its the fact the front pump cannot/does not turn when the transmission is driven from the output side---this is where damage occurs.

But I will repeat don't flat tow ANY vehicle without first disconnecting the driveshaft!!

Very correct---when I've flat-towed something I simply disconnected the rear u-joint from the differential leaving the driveshaft still in the transmission case.. I'd secure the driveshaft to the frame with ratchet straps to the frame, placing them so they held the driveshaft in the transmission.