Paccar Automated Transmission Now Standard on Kenworth T680

December 19, 2017

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Paccar's 12-speed automated transmission. Image: Paccar
Paccar's 12-speed automated transmission. Image: Paccar

Kenworth has announced that the 12-speed Paccar Automated Transmission and right-hand column-mounted shifter will be standard equipment on linehaul and regional haul applications of Kenworth’s on-highway flagship T680.

The action completes the Kenworth T680’s transition to the Paccar proprietary standard powertrain of engine, transmission, and tandem rear axle to maximize efficiency and driveability.

“The seamless integration of the proprietary Paccar Transmission with the Paccar MX-13 engine and Paccar tandem rear axles in the Kenworth T680 provides new levels of fuel economy and weight savings performance, and a powertrain second to none providing benefits to both fleets and individual truck operators,” said Kurt Swihart, Kenworth marketing director. “In 2017, approximately 70% of our linehaul customers purchased automated transmissions, up from about 30% in 2013. We’ve received a very positive response from fleets involved in the Paccar transmission’s testing and validation program.”

Kenworth’s new column-mounted shifter for the Paccar Transmission places gear selection and engine brake controls at the driver’s fingertips for better ergonomics, comfort and overall performance. With the shifter right there on the steering column, the driver does not have to reach for it. This placement also frees up dash space by eliminating engine brake control switches.

The Paccar Transmission is said to be ideal for linehaul and regional haul applications up to 110,000 pounds gross vehicle weight. The Paccar MX-13 engine is available with ratings up to 510 horsepower and 1,850 lb.-ft. of torque. The transmission is up to 105 pounds lighter than comparable transmissions, according to Paccar, allowing for greater payloads.

The new Paccar Transmission provides a 750,000-mile oil change interval. Other features include a maintenance-free clutch, and an internally routed electrical system that minimizes exposure to the elements. The fluid pressure detection system protects the gears from low fluid conditions.


  1. 1. MC [ December 21, 2017 @ 05:07AM ]

    "The new Paccar Transmission provides a 750,000-mile oil change interval.

    Is that a typo? Is it supposed to say 75,000? I've never seen a petroleum lubricant (natural or synthetic) that has the durability to handle the kind of stresses a transmission puts on oil for 750,000 miles. Even the best synthetics break down and separate from their additives. At 150,000 miles you're just begging for serious downtime.

    If it's not a typo, I would love to see what the oil and the transmission's parts look like after 750,000 miles (REAL miles under REAL loads, not clean-room test facility 'virtual' miles).


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