It's okay to tow a 463 with ALL the wheels on the ground (short dist, low speed) or with all the wheels OFF the ground.  But NOT with one set of wheels on the ground and one off.  What happens then is that the center diff spins like MAD due to the speed difference between front and rear drive shafts, and very quickly wears the gears and bearings.  This is a very very bad situation.  I would talk to a knowledgable dealer about it and see if they'd back you up in a claim that the vehicle was improperly handled, and see if you could get the transfer case replaced on a claim against the towing company.

There was a time when towing companies could be forgiven for not knowing about all wheel drive utility vehicles.  In my opinion that time passed about 10 years ago.

-Dave G.

True in some cases, no doubt, but not in this one.

What's been done in effect is to put wear on the center diff at a hugely accelerated rate.  Given the components have a life span for wear, it's just been advanced well through it's life span so that instead of being 10% gone, maybe it's now like 90% gone so you have less life left in it than you did before the abuse.  It's not at the end of it's life yet, but it's a heck of a lot closer than it would have been without the abuse.

Same thing happened in a different way to the transfer case in my 460.  When some bearings went south and I figured out that the front prop shaft aided oil supply, I looked back into its history and found that both I and the previous owner had driven the truck some distance with the front prop shaft removed at various points in it's life.  There were no obvious ill effects at the time of the individual transgresions, but later on down the road, the components that had been unduely worn during the abuse gave up prematurely.

Now, when everything is fresh in everyone's mind is the time to pursue compensation.  If the box craps out in a year, at a cost of many thousands to replace, nobody will remember anything about how it was towed.

-Dave G.

FWIW, I'd be doing everything possible to get some action based on the simple fact that this type of towing is contrary to the manufacturer's recommendations.  Regardless of what the drain plug or oil look like.  I agree with Dutch though, that having oil analysis performed on the t-case oil is a good idea.  Especially if you could also have a "control" sample from a non-abused truck analyzed as a baseline.