I once towed a 1973 Plymouth with a torqueflite from Hobbs NM to B'ham AL with a towbar (I actually only towed it to Jackson MS before it pulled out to pass, and then I towed a Ford pu the trst of the way). I just let it idle all the way back....

I would not trust a plate on the shifter, myself. I'd spend 20 minutes with a drain pan and a 12mm and 14mm wrench under the truck pulling the driveshafts, or just pull the rear and put the tcase in 2hi.

Not responsible for advice not taken...