Need recommendation from Mr Truck/truck experts:

While pulling my 2H GN Sundowner when I stopped 100 miles down the highway from home, I backed up into a parking area and when I got out, transmission fluid was pouring out of the seal . I shut off the engine and parked for greater than an hour to cool off and started up again and checked the fluid level to find it was "full" No more leaking this time, I continued down the road (flat, eastern NC) with no other problems. Is this a fluke incident? or the indication of more to come? Truck has only 63K, transmission was rebuilt at 45K 4 years ago. (I don't drive it much) My trailer weighs 4000K empty and I only had one horse on it at the time. I am open for all recommendations. 

Thanks in advance!!!

Hello again ... I wondered what happened to you ...

This could be a very bad problem unless you take immediate action. There are two possibilities:

1)  You over filled the transmission ... Only you know if you added some ...

2) You have a ruptured transmission cooler.  Most vehicles have a transmission cooler built into the radiator.  If it ruptures, the pressure of the radiator forces coolant into the transmission.  The natural result is the transmission fluid finds a way out.  The final quirk is the transmission dip stick will show only transmission fluid.  All the water based coolant is at the bottom.  (oil floats on water)  Transmissions don't last very long filled with coolant instead of tranny fluid.

I agree with hosspuller. When over full it can spit out the front seal in front of the pump or the back side of the torque converter. When this happens to me, the torque converter has died.

Tell them you had the transfer case serviced, and the the facts about the fluid coming out.  They should be able to figure out the problem with the truck in front of them.  All we can do is guess over the internet.