Different option packages...some have badges, some have decals.

My Dad's 1976 Power Wagon (now mine) didn't come with the "Power Wagon" badges on the hood (was special-ordered new and has many unique features). My old black 76 W100 (now sold) had the Power Wagon badges on the hood.

As stated, many 4wd Dodge trucks in those years had the Power Wagon badges/decals. These are not comparable to the current Power Wagons, which are special, off-road editions of the Ram pickup. In other words, a '70s Power Wagon or '80s "Power Ram" would not have a factory winch, electronic disconnecting sway bar, electronic locking diffs, etc.

75-79 had NP203 Fulltime 4wd, stock.

1980 started the name "Dodge Ram" and would say so on the tailgate (most models), along with a Ram decal on the front fenders. 1981 started the new bodylines that continued thru 1993, and 4x4s in these years are called Power Ram.

JS