These two Ram 1500 models are two types of the same model with one major difference, the powertrain. First of all, the 2017 Ram 1500 Crew Cab has a more powerful engine and gets 5.3 mpg less than the 2017 Ram 1500 Crew Cab Diesel. Also, there is a notable difference in the starting price of the 2017 1500 Crew Cab, which is $8,200 less than the base MSRP of the 2017 1500 Crew Cab Diesel. In addition, you'll seat one more passenger in the 1500 Crew Cab than in the 1500 Crew Cab Diesel. Among similarities are the body structure, ground shadow size, and height.