tranny swap

I have a 55 willy truck with a 283 in it. I am getting ready to install a 700r4 and 208 transfercase with original axles in front and rear. I plan on changing the rear to a 9 or 8.8 soon as well M question is do i change the transfer case or leave the original one? and what about the rear cross...

This is kind of a "if it fits, it ships (drives) question. I have a 1956 PU, 4x4, 226 L6 and I have a spare freshly rebuilt tranny from a 1949 with matching engine (in fact it is the trannies matching engine), so the question is does the tranny to frame cross member fit the 56 (49 to 56, I can...