I know the manual, every mechanic I have met, Mr. Slee (bow), Texican (bow again), and the rest of the very knowledgeable folks on here say not to flat tow an 80. My 1993 is old enough, and I was broke enough, that I thought I would try it, and if it tore up, then I would get something else.
I tow with a 400 HP diesel pusher motorhome, weighs maybe 37,000 pounds. The 80 has a supplimental towing brake system. My tow bar attaches to the tow hooks, no $300 baseplate needed. Transmission in Park, transfer case in Neutral. Key turned on, then off to unlock the steering wheel lock.
I checked while towing across the desert, and the transfer case is not even warm, usually about 10 degrees over ambient. No axle diffrential rotation, so the VC is not being exercised.
I have flat towed from DFW to Sherman, TX, to Fort Worth, to Amarillo, to Phoenix, to California border, to Phoenix, to Amarillo, to Eugene, Oregon, to Phoenix, to DFW to Amarillo.
I have had no issues, and the old dear is still chugging along, shifting just fine. The motorhome does not even know it is back there.
With all the advise to not flat tow, I cannot suggest it. But, it works for me. When I hit the lottery, and Ben and Christo get the 80 for a spa day (month), I will have the 12 volt powered oiler installed.
For lights I use magnet trailer lights on the roof. In Arizona the cross winds WILL blow them off, so have some duct tape handy.
Hey, I did not say it was a class act, just that it works for me.
Thank you for this post!

