 FACT: When Dan, Jerry, and Tom are driving the duke to go on their  expedition, Dan refers to the Duke as having "the 318 V8, theyre  bulletproof." Wagoneers were never offered with a 318in3, especially  not in 1977. The 318 was a Chrysler motor, and in 1977 Jeep was  still under the ownership of AMC, and would come with either a  258in3I6, a 360in3V8 or a 401in3V8.