• The PACCAR powertrain offers an integrated solution for maximizing MPG and payload capacity
• It combines durable PACCAR MX engines and DX-40k tandem drive axles
• The integration of these components allows for effortless pulling, improved efficiency, enhanced fuel economy and increased driver comfort
• The PACCAR MX-13 and PACCAR MX-11 engines utilize a combination of proven technologies and state-of-the-art innovations
• These engines are designed to maximize MPG and achieve the lowest possible fuel consumption, emissions and noise levels
• They incorporate variable speed engine components and optimized combustion
• PACCAR MX engines deliver exceptional reliability and proven performance, whether in linehaul or vocational heavy-duty truck applications

Other powertrain highlights include:

• Gear ratio coverage for slow-speed maneuvering
• High-performance thru-shaft pinion design that transfers full engine power straight to the road
• Fuel system efficiently optimizes combustion and decreases noise
• Broad torque curve that delivers up to 1,850 lb.-ft. and peak torque at low rounds per minute (RPM)
• Long-life maintenance intervals

The new PACCAR TX-12 PRO automated transmission is designed to be versitile and efficient, while also remaining tough and durable. It is engineered to operate with engines that have up to 1,000 lbs.-ft. of torque and a maximum Gross Combination Weight Rating (GCWR) of 70,000 lbs. 

More TX-12 Pro Features and Benefits include:

• Dual PTO functionality to power multiple hydraulic devices simultaneously
• New Extreme Duty Clutch for improved low-speed maneuvering with higher loads
• Rock Free Mode helps rock the truck free from mud, sand or snow
• Off-Highway Calibration enables shift points that are tuned for changing off-highway conditions with a bias toward shifting less often
• Secondary Configuration for a tailored driving experience that accounts for toggling between two calibrations for the load or terrain

Cab

• Engine enhancements such as smoother operation, crank-mounted fan, engine-mounted air cleaner and acoustically tuned engine mounts improve the driving experience
• Trim levels feature dark dash and door pad uppers for reduced glare
• The spacious interior includes larger panel switches, large cupholders with storage, a new smart steering wheel with audio/phone and cruise controls, dual USB chargers and LED lighting
• The 15-inch digital display is the largest in the industry, providing easy-to-use features and a configurable interface

Sleeper

• The interior of the new Model 579 sleeper provides home-like comfort
• The 80-inch UltraLoft sleeper offers 8 feet of headroom, 70 cu. ft. of storage and the largest mattresses in the industry
• It can accommodate up to a 32-inch TV and a 1.1 cubic-foot microwave, both the largest in their class
• In the double bunk configuration, a foldaway ladder conveniently disappears when not in use
• Sleeper features include sound abatement technology, independent HVAC with separate controls, optional fuel-fired heater and multiple no-idle hoteling options

The Peterbilt 579 UltraLoft offers a range of customizable fleet spec options designed to optimize performance, efficiency, and driver comfort for various applications. These options allow fleets to tailor the truck to meet specific operational needs while minimizing total cost of ownership. Key fleet spec options include:

• PACCAR Powertrain with MX Engine, TX-12 Transmission & DX-40 Axle
• Molded black aero chassis fairings
• Advanced aero rear-view mirrors 
• Halogen headlights
• Sleeper baggage door & tilt windows