It's been 8 months or so.. but if I remember correctly I jacked up the transmission as high as I could and was able to use a regular sized wrench from the top.
you won't be able to remove the bolt until the transmission is partly out. Don't forget to put them in before you raise the transmission back into place. Use heavy grease to hold them in place
to be perfectly honest mine's an auto, behind a 2.8 so that trick might not work with your truck.