To better meet the needs of vocational applications, many of the Allison transmissions have been recalibrated, and they’re now backed by longer warranties for 2005. For example, the Allison 1000 EVS - used with fire, rescue and ambulance packages on C4500/C5500 models - features a five-year, unlimited mileage, limited warranty. A two-year, 100-percent parts and labor coverage warranty, plus a three-year extended transmission coverage back the Allison 1000 MH and 2200 MH - featured on C4500/C5500 motor home series. Mileage coverage is extended to 200,000 miles. Allison vocational transmissions also are added on the 2005 C6500 and C7500 models. A 2500 HS Allison transmission replaces the 2000 Series transmission in all applications. The 2500 HS allowed a gross vehicle weight rating (GVWR) increase to 33,000 lbs. for 2005 versus 30,000 lbs. for 2004. The Allison 3000 RDS close-ratio six-speed automatic transmission becomes the base transmission on C8500 models and is available on C6500 and C7500 models. A number of other transmission choices are also available. Reliable, Durable, and Efficient The medium-duty trucks include a unique service design, called “Priority Access System,” which integrates components into major modules within the engine compartment. This allows groups of parts to be removed by a technician either independently or in sequence, depending on how much accessibility is required. Other upgrades have been engineered to increase reliability and lower the overall cost of ownership. In 2005, C6500-C8500 models use a 120,000-psi heat-treated frame for an even stronger frame rating. Compared to C4500 and C5500 models, C6500-C8500 feature larger frames and offer a wider selection of wheelbases and single and tandem rear-axle configurations to accommodate larger bodies. Single-axle models can easily accommodate bodies up to 30 feet (9.1 m) without requiring any extra-cost frame extensions. Braking system design improvements include longer design life and a simpler disc-brake-pad removal and replacement process. The electrical system has been redesigned to take advantage of new multiplexing technology, meaning fewer wires and connections doing more work with less complexity. New Braking System
C4500-C7500 models feature new hydraulic four-wheel anti-lock disc brake systems with standard four-channel ABS, electronic brake distribution, and available traction control. The C4500 and C5500 trucks use two systems to optimize performance for particular GVW requirements, with both offering reduced stopping distances, lower pedal effort, and quieter, longer-life operation. C6500-C8500 models, meanwhile, feature low-drag, opposed four-piston, fixed-caliper brake design with diameters sized to particular GVW load requirements. Premium, high-capacity 70-mm, four-piston brake systems are now standard on both the front and rear. All Crew Cab models feature the HydroMax brake booster for brake actuation. Both HydroMax and Hydroboost (used on some conventional cab vehicles) operate on the same principle, with the power steering pump supplying the booster power. A tandem (split) master cylinder provides the independent front and rear circuits for the hydraulic brake system. Sensors warn the driver of “low fluid” or secondary brake failure. Expanded Model Range
The Kodiak and TopKick C4500 and C5500 Series are available in Crew Cab, Regular, and Commercial Cutaway Chassis Cabs, as well as vocational packages to cover fire and rescue, ambulance, shuttle bus, wrecker, and snowplow requirements. For larger tasks, the Kodiak and TopKick C6500, C7500, and C8500 Series (Class 6, 7, 8) trucks feature Regular and Commercial Cutaway Chassis Cab offerings, along with the Crew Cab and T-Series. This model range also includes LoPro (low profile) and Tandem axle variants.