Searched and found some answers but not really what I'm looking for so here's my specific question. I have a 66 shortbed with a 350/TH350. Want to swap in a 700r4. Will I have to modify anything or will this bolt in. Have read there are short and long shaft TH350. How do I know which I have? What about the driveshaft? Will it need to be cut down? Will I need a different yoke? Anything else?

There should be more in the FAQ truck tech section, but this thread should be helpful.
http://www.67-72chevytrucks.com/vboard/showthread.php?t=33266

Searched and found some answers but not really what I'm looking for so here's my specific question. I have a 66 shortbed with a 350/TH350. Want to swap in a 700r4. Will I have to modify anything or will this bolt in. Have read there are short and long shaft TH350. How do I know which I have? What about the driveshaft? Will it need to be cut down? Will I need a different yoke? Anything else?

Try this site:

http://www.tciauto.com/Products/TechInfo/trans_dims.asp