Widely considered as the best AMC design of all time, a third-generation AMX concept car, the AMX/3, debuted at the 1970 Chicago Auto Show. Engine-less and fashioned in fiberglass, the original AMC/3 prototype was a show car only.
American Motors placed an order for 30 operational cars. The AMX/3 body mold was sent to Italian GT maker Giotto Bizzarrini, whose Turin facility hand made drivable mid-engined, steel bodied cars. Built on a 105.3-inch wheelbase, the Bizzarrini prototypes used the AMC 390 cubic inch V-8 and an Italian OTO Melara four-speed transaxle. Road testing was done by BMW, which declared the AMX/3's chassis one of the stiffest and most neutral handling they had ever tested.
The steel Italian cars differed from the original AMC design in having fewer but functional rear decklid louvers, louvered hoods, and, in some cases, hood scoops to direct fresh air into the heating-A/C system.
Five completed cars were produced before the US$2,000,000 program was cancelled. Escalating costs and pending bumper regulations put a stop to the mid-engined AMX/3.