Thanks for your suggestions. I ended up taking my wagon and a hand truck. I also took a buddy to pull the hand truck. I found my transmission, its a B-W R10K-1 out of a 62 Chevy car. The only thing missing is the shift arms, which I can keep off of the 3-spd that I have now and the manual OD shift cable.
I know this question is probably out of place, but do any of you with 3spd w/ od's have a diagram how to wire it up to your truck?
I'll try to get some pictures put up as soon as I have a chance to borrow my brother's camera.