Isuzu has announced the start of sales of its new F-Series medium-duty (Class 6-8) truck for the ’04 model year. The OEM pointed out that refinements of the frame design allow the trucks to accept a wide range of truck bodies. Key F-series features for ’04 include standard Allison automatic transmissions, optional Eaton Fuller manual transmissions, improved brake systems, 19.5- and 22.5-in. wheels and tires, new 14.6K front axle (with up to 16K available in January), cruise control and available traction control. The Isuzu 6HK1 7.8-liter diesel engine is the only powerplant offered. It is now available in 200- to 250-hp versions. In early ’04, 275- to 300-hp ratings will be added.