Kenworth Adds Bendix eTrac System for 6×2 Suspensions

Kenworth is introducing the Bendix® eTrac™ Air Bag Transfer System for 6×2 suspensions on select models of Kenworth Class 8 trucks.

“With one ‘live’ drive axle, trucks with 6×2 axle configurations can offer significant weight savings as well as fuel economy improvements over that of a truck with a traditional 6×4 axle configuration,” said Kevin Baney, Kenworth chief engineer.

The Bendix eTrac system will be available on the Kenworth T660, T680, T800 and W900 in May.

The tandem drive axle on a 6×2 axle truck has no inter-axle driveline or rear differential. Because of that, it has fewer gears, and as a result, weighs several hundred pounds lighter and experiences fewer parasitic losses for improved fuel economy. The combination of a 6×2 tandem axle configuration and wide-base tires may provide a significant fuel economy improvement, which will vary depending on use, road conditions and other factors.

“The Bendix® eTrac™ system links into the Bendix ABS braking system with automatic traction control (ATC) and electronic stability programming. This system automatically engages and disengages – without driver input – the vehicle’s airbag pressure transfer system, transferring pressure from the non-drive to the drive axle when it recognizes wheel slip. This provides improved fuel efficiency in a lighter package combined with on-demand traction,” Baney said.


“We expect the traction-boosting technology provided by the Bendix eTrac system will greatly interest Kenworth’s customers,” said Erik Johnson, Kenworth on-highway manager. “Customers can benefit from fuel economy improvements and the lighter weight of 6×2 suspensions, in addition to enhanced traction.”

The Bendix eTrac system protects the drivetrain by automatically disengaging after a low-traction event or when the vehicle’s resumed speed exceeds 25 mph. The system also allows for manual activation at speeds below 10 mph, or when a vehicle’s ATC mud/snow switch is enabled.

For more information, contact your Kenworth dealer or Bendix Commercial Vehicle Systems (

Kenworth Truck Company is the manufacturer of The World’s Best® heavy and medium duty trucks. Kenworth’s Internet home page is at Kenworth is a PACCAR company.