700r4 to t400 chaneout
 

I want to switch out my 700r4 in my 84 Chev 1/2 ton 4x4 truck with a t400.
I have a fairly new 208 transfer case and would like to keep it. Has any one done this before? I know Advaced Adapters makes the stuff to do it but I was wondering if GM ever made this set up in a truck.

Wayne