It might be stock if you live in an alternate universe where Ford put Dana 60's in 250's and 350's and a Dana 44 or custom 9 inch in the 150's. Are you sure it is a 96 because if you are really living in an alternate universe it may be an 06 since there Ford would never have gotten rid of the OBS and 7.3.
Ok dumb question but what does TTB stand for? I'm new to this truck stuff ive owned 48 mustangs(yes 48!!), 2 trans ams, and currently 2 ford falcons, I just don't know all the lingo about trucks yet, and I'm GUESSing it's a Dana 60 cause that's what people have told me it has, could it be something else?