I was at a friends house in the woods, and they had a new black top rd. We went riding around, and I thought I would down shift, and floor it . Boy was it fun (454/350trans). Bad thing is I plit the trans in half . U-HAUL did not have a trailer or dollie to pull my truck home, about 40 miles away from my house. My friend suggest we pull it with his truck. No big deal. I put the transfer case in neutral and the trans in neutral. We stop to get gas, for his truck, and at some point, I'm sure when we stoped for gas I put the trans in park. We took of, And I forgot to put the trans in neutral again. So at this point the T/C is the only one in neutral We get about 30 miles from my house and I smell gear iol burning and notice my truck feel real heavy on the pull. I get the driver to pull over and I get out the truck, look underneath and both my DIFF's front and rear are SMOKING BAD. I put the trans in neutral and the T-C is still in neutral, I hope it worked. 2 miles in the pull the truck felt heavier , we pull over again and the DIFF's are smoking real bad, PURE WHITE TO, like if they got red hot. Well the truck did not want to budge. I ended up calling a flat bed (SAFE CLEAR SUCKS) and they came out with a normal tow truck. He lifted it upfrom the front and moved it back and forth a foot or so, and it seem to be binding in the rear, the rear wheels would move then lock up. I'm pissed at this point, I tell the wrecker driver to give me a 7/16 to pull the rear drive shaft. I pull it off and truck moves freely now . We get it home, he drops it off in my drive way and it would roll with out the rear shaft . I dont understand how my diff's would get so FREAKIN HOT. The gear oil on the front shaft shot out one side. What did I do????? Did I ruin my T/C???