The 79'-81' Prototype's were powered by a heavy duty version of AMC's 401 V8 engine, Turbo hydromatic 400 transmission, Spicer transfer case, and was equipped the all new independent suspension Model 20 which were made from case aluminum.
The powerful but inefficient AMC V8 wasn't producing enough vehicle range to meet military specifications. The vehicle had some stability concerns. vehicle was expanded into the "Humvee" we know to this day. AM General decided to power this new "humvee" with the all new GM-6.2L diesel engine.
This Vehicle was sent to the US Armed forces for testing and evaluation, A contract was signed for 55,000 units by 1985 AM General rolled the first of many humvees off the assembly line.
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