I am undergoing a similar swap on my '64 Stepside. We have a '66 donor truck with the power glide, but I will be using the 700R4 in our '64. I was under the assumption that they would be the same. They were not.
I am not sure about a Suburban, but you can buy one for a C-10 or C-20 in that year allready built for as little as $79.95 + S&H . As for me, I am building my own super hevy duty version!
I would tend to think the Suburban and pickup would have the same frame. But I am not shure on that.
Good luck !
