Goodness, sounds like you have some troubles! I'm not entirely sure what it means by when you say when you shift the truck doesn't move unless you use overdrive? You mean, automatic transmission, using the Overdrive selection? Instead of...?
The oil pan - I'm guessing it's rotted through; epoxy will not help you...nor will any other kind of sealing device.
Transmission oil lines is in your subject - those are probably obselete now from Ford but can be made from bulk components. Try a local shop:
http://repairpal.com/directory?address=54562&car_brand_na...
Good luck!