Despite huge and growing costs, Ford decided to continue development of the GT40 for the 1967 season. The J cars
used honeycomb-sandwiched aluminum panels which were bonded together. The J car used this honeycomb aluminum to form a central tub chassis similar to the GT40’s. Lightweight and rigid, the new chassis saved considerable weight. The final specification for the car adhered to the Appendix J regulations for race car construction.
The dozen J cars were produced by Ford's subsidiary Kar Kraft.
With Shelby-American drivers Dan Gurney and A.J. Foyt, the Mk IV delivered a second consecutive victory for Ford at Le Mans in 1967. Ford's absolute dominance was a resounding double defeat of Ferrari. |   In two races, Sebring and Le Mans, the Mk IV so completely dominated the competition that the FIA rendered it illegal for 1968. | |