Took a look at the pix, 8 lugs, 3/4 ton. I didn't notice any lockouts on the front axle. Are you certain it's a 4x4?
wow now I feel dumb... see what I get for thinking, it is indeed a 2wd I assumed it was because of the lockouts on the rear wheels, have not looked under the front until now, but it is a 2w rear wheel drive, I'm used to front wheel drive and just assumed.