These two Ram 1500 models are two modifications of the same model with one major difference, the powertrain. First of all, the 2017 Ram 1500 Quad Cab has a more powerful engine and gets 1.5 mpg less than the 2017 Ram 1500 Quad Cab Diesel. Also, the 2017 1500 Quad Cab is priced $7,300 lower compared to the base MSRP of the 2017 1500 Quad Cab Diesel. Among similarities are the body structure, ground shadow size, height, and maximum occupancy.