Isuzu Truck (

N-Series. The N-Series is all new for 2008, with a number of improvements specifically focused on increasing driver comfort, which results in increased driver productivity. N-Series drivers will quickly note the larger and more spacious cab, with more side-to-side and front-to-back room. This results in more seat travel, as well as increased headroom, shoulder room, and legroom—on both standard and crew cab models.

To further aid driver convenience, the N-Series also features a new, more modern dashboard with a full complement of easy-to-see gauges and warning lamps. It features a five-din opening for such optional equipment as radios, GPS systems, and rear view cameras. The front of the cab features an easy-to-remove panel for easy access to the wiper motor and linkage, electrical cab connections, and air intake filters, facilitating maintenance of these items. Storage areas abound in the 2008 N-Series, including in the seat backs, dashboard, glove box, overhead storage shelves, and rear storage organizer.

In addition to being more comfortable and more convenient, the all-new cab is built to last a long time, with greater rust and corrosion protection from the galvanized steel panels to the electro deposit paint primer and high quality enamel paint top coat. The close section and increased gussets and reinforcements also improve the durability of this new cab, as well as increasing the safety of the driver and passengers. Additional safety items found on the 2008 N-Series include: a new seat belt design; low-cut side windows; larger, 17-in. by 8-in. side mirrors with integrated convex sections; and available heated mirrors.

N-Series Long Wheelbase. The 2008 NQR and NRR LWB N-Series models are available for customers looking for long-wheelbase low cab forward trucks. NQR 22-ft models are now available with a 200-in. wheelbase—24 in. longer than the previously longest wheelbase of 176 in. For those companies requiring an even longer wheelbase, NRR 22- and 24-ft models are available with a 212-in. wheelbase.

NQR and NRR LWB models are powered exclusively by the overhead cam 5.2L 4HK1-TC turbocharged, intercooled, diesel engine. It delivers 205 hp and 441 lb-ft of torque and is mated to a new Aisin A465 heavy-duty six-speed automatic with double overdrive.

NPR Gas Crew Cab. Another addition to the N-Series lineup is the NPR Gas Crew Cab. It combines the added interior room of a crew cab with the power and convenience of a gasoline engine. The NPR Gas Crew Cab will be available later in the model year and will be powered by the 325-hp Vortec 6.0L V-8 engine that is mated to the Hydra-Matic 4L80 four-speed automatic with lockup torque converter and overdrive.

F-Series. The F-Series value is further accented for the 2007 model year by a number of improvements to the Allison transmissions. The Extended Service Coverage on Allison 2200 HS and the 2500 HS transmissions increases to four years with unlimited miles. Previously, the service coverage was for three years. Both transmissions are now six-speed with a second overdrive ratio to improve driveability and fuel economy. The Allison 2200 features a close-ratio design, a park pawl, and is rated for a maximum GVWR and GCWR of 26,000 lb. The 2500 HS features a wide ratio design without a park pawl and is rated for a maximum GVWR/GCWR of 33,000 lb.

Factory-fill TranSynd transmission fluid is required by Allison to allow the longer Extended Service Coverage. TranSynd can also extend Allison transmission oil drain intervals up to 400 percent, further reducing vehicle downtime.

Other Allison vocational transmissions available on the F-Series include the 2200 and 2500 RDS on Class 6 and Class 7 models. The Allison 3000 RDS close-ratio six-speed automatic transmission is standard on Class 8 models and is available on Class 6 and Class 7 models. Available on all F-Series models are Allison 3500 RDS, 3000 EVS, and 3500 EVS transmissions—offered in five- and six-speed versions. All of these transmissions include Gen IV controls for smoother shifts.

F-Series customers may also equip their vehicles with an Eaton-Fuller manual transmission available in six-, nine- or ten-speed (8+2) configurations.

H-Series. Smoother-shifting transmissions—many with extended service coverage—lead the list of product enhancements on 2007 H-Series. Allison 2200 HS and 2500 HS (Highway Series) now feature a four-year, unlimited mileage warranty.

Additional Allison transmission enhancements for 2007 include Gen IV controls on HTR (Class 6), HVR (Class 7), and HXR (Class 8) models.

For 2008, the N-Series overhead cam 5.2L 4HK1-TC turbocharged, intercooled, diesel engine delivers more power and reduced emissions. Horsepower increases to 205 @ 2,400 rpm (up from 190) and torque increases to 441 lb-ft @ 1,850 (up from 387). It covers GVW ranges from 12,000 lb to 19,500 lb and has a B10 durability rating of 310,000 miles, which means 90 percent of the engines should reach this mileage before a major component failure—provided good maintenance practices have been followed.

The 5.2L diesel engine is equipped with a standard fuel/water separator that is heated with returned fuel and features a dash-mounted warning lamp. This separator warns the driver when water is present in the fuel filter and needs to be drained, which helps prevent vehicle down time and supports a more efficient operation. The 5.2L diesel engine can be mated to the new Aisin A465 heavy-duty six-speed automatic with double overdrive or with a six-speed manual transmission with all forward gears synchronized. The six-speed manual will be available later in the model year.

The Isuzu 6H diesel engine returns as a 7.8L workhorse that is offered with five horsepower and torque outputs on Isuzu F-Series models. The base rating increases to 215 hp and 560 lb-ft of torque—a 7.5-percent increase in both horsepower and torque over the 2006 models. It is the base engine in Class 6 and Class 7 models. The 6H engine is available with a maximum of 300 hp and 860 lb-ft of torque and has a B10 durability rating of 410,000 miles.

All 6H engines feature an integrated oxidation catalyst, diesel particulate filter, and GM’s patented exhaust gas cooler. Higher-output versions of the engine feature a higher-capacity DPF.

For N-Series customers who prefer a gasoline engine, NPR and NPR HD models are available with the Vortec 6.0L V-8 engine. For 2008, the Vortec 6.0L engine delivers 325 hp—25 more than the previous version—and 360 lb-ft of torque. These models are mated to the Hydra-Matic 4L80 four-speed automatic with lockup torque converter and overdrive.

The Vortec 6.0L is 50-state compliant with federal CFFV/LEV and California ULEV emissions requirements. It has a 200,000-mile design life and is backed by a three-year/36,000-mile warranty. Customers may also purchase extended service plans that cover their vehicles for up to five years/100,000 miles.

Both the Isuzu 4H and 6H engines meet EPA requirements that became effective January 1, 2007. For the reduction of nitrogen oxide levels, the 5.2L and 7.8L diesel engines use an advanced exhaust gas recirculation (EGR) system and a variable geometry turbocharger.

To reduce particulate matter, a ceramic honeycomb channel diesel particulate filter (DPF) was created to capture sulfate particles and soot. Exhaust gases are directed through the channels and a porous material that traps the particulates. To clear the particulates and prevent clogging, a regeneration process occurs to burn off the trapped particulates and clean the filter using high exhaust gas temperatures.

Regeneration in Isuzu trucks can occur in a number of ways. Self-regeneration is an automatic process that occurs as the vehicle is driven throughout the day, and does not require driver involvement. The vast majority of vehicles will regenerate automatically. Forced computer-initiated regeneration occurs if the vehicle operation does not produce exhaust gases hot enough for the automatic process to occur.

In the event that the computer cannot force regeneration, a control light will alert the driver to activate a dashboard switch to initiate the regeneration process. Special system-sensing and control software was developed to precisely control engine combustion and DPF regeneration.

To meet the EPA regulation for lower diesel fuel sulfur emissions, Isuzu-designed emissions systems work efficiently with the new fuels and lubricants. The 2007 emission regulations also require all crankcase gas emissions to be reduced. To comply, a closed crankcase system was added to reroute ventilation gases back into the engine for combustion.