I'm going to PM/email you because it's very important I get this thing identified as soon as possible. I'm giving the truck to my pops and he's going to order a new drivetrain for the thing and we're going to install it next week.
I looked to the right of the main driveshaft and I see an 8-bolt cover. It appears that if you were to take off the 8 bolts this would give you access to the gearing that drives the front wheels...hope I'm looking in the right place.
I can snap a picture..but from what you said, I don't see 3 bolt cover so it has to be a...NP 203
I'm going to go snap a picture or two.