DEARBORN, MI - Ford announced June 7 it will begin offering an alternative-fuels engine prep package for its 6.8L F-450 and F-550 Super Duty chassis cab.

The automaker made the announcement to approximately 500 North American fleet at the annual Ford Fleet Product and Business Conference in Dearborn. Ford presented details of the conversion option, which will become available this fall and enables the use of efficient, clean-burning compressed natural gas (CNG) or propane (LPG or liquefied petroleum gas).

F-450 and F-550 Super Duty are Ford's latest commercial vehicles to get the alternative-fuel conversion option. Since introducing the option to E-Series and other commercial fleet vehicles last fall, Ford has shipped some 3,000 E-Series vans with CNG/LPG-prepped 5.4L and 6.8L gas engines to fleet operators such as Verizon and Schwan's Home Delivery Service, according to the automaker.

Ford also offers the package on its Transit Connect, including its new Taxi offering with a 2.0L four-cylinder gas engine. This fall, Ford also will add CNG/LPG capability to the F-53 motor home chassis and new F-59 commercial strip chassis.