 The engine is a simple Chevy...  The engine is a simple Chevy 6.2L diesel. The naturally aspirated engine makes great torque, runs cool, and uses very little fuel on the trail. The air intake was built using pieces from a Hummer H1 mated with a k&n conical filter. |  The divorce-mounted nP205...  The divorce-mounted nP205 transfer case is well protected and tucked up between the framerails. Using Rockwell top-loading axles allows excellent driveshaft angles; however, the pinion brakes heat up quickly when used at high speeds over long distances. |  The interior of the M715 is...  The interior of the M715 is spartan and uncluttered, just as a military truck should be. Estes built a custom cage that fits under the stock canvas top and protects the occupants in case of a rollover. Dual Optima batteries and a Gast air compressor are mounted between the seats of the wide cab. |