Stock or replacement

As I was working on the truck today, I stumbled across some sheet metal in the bed and an old emergency brake cable, as well as other sheetmetal formed to cover the side hole where the internal gas tank had it's filler pipe going out of the truck.
Anyway, my question of the day was is this (see below photo) the stock pumpkin or (as I am hoping) a 9" rear? Since I haven't a clue, I thought I'd throw it out there to you guys.
http://i217.photobucket.com/albums/c.../bedoff023.jpg
http://i217.photobucket.com/albums/c.../bedoff025.jpg

That's not a 9". The 9" has a removable center section and not a removable rear cover....

Thanks Dave. Well it was worth checking out. That's the next section to deal with after the frame and the cab of the truck. :CRY:

Looks like a Dana 44 based on the pictures at
http://coloradok5.com/axleguide.shtml