When American Motors bought Jeep in 1970, it built and sold DJs via its AM General subsidiary. The DJ-5 was a stripped-down, two-wheel-drive version of the pretty-spartan-to-start-with Jeep CJ, and there wasn't much to go wrong with it. The final year for the DJ-5 was 1984.
During the AMC era, the DJ received an ever-shifting array of engines, depending on what looked like the best deal in Kenosha at a given time. Starting with the Chevrolet Nova straight-four, Jeep DJ engine compartments boasted AMC straight-sixes of 232- and 258-cubic-inch displacements, followed by Audi 2-liter straight-fours (yes, the same engine used by the Porsche 924), then the 2.5-liter GM Iron Duke four, and finally the 2.5-liter AMC straight-four. This DJ-5L has Duke power.
The early DJs had manual transmissions, but all the AM General DJ-5s came with automatics. If you think an Iron Duke powering a Jeep is odd, consider that it's bolted to a Chrysler Torqueflite transmission.
Once the USPS was done with them, cheap DJ-5s flooded the market. This one has had a random junkyard seat swap, but retains the handy mail-sorting tray.