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Downspeed

Hill Climbing's Easy for mDrive and 'Downsped' MP8 Diesel

The Pinnacle-pulled rig weighed close to 80,000 pounds. So how did it pull the hills at such low engine speeds? With 1,860 lb-ft of torque, and with no more speed loss than one would find with higher revving engines.

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Testing Out Dana's Dual Range Disconnect [Video]

First revealed at the Mid-America Trucking Show in March, Dana's Dual Range Disconnect drive axle system gives users the fuel savings of a downsped 6x2 drivetrain and the traction and performance of a conventional 6x4 setup. How's that possible you ask?

Focus On...Spicer AdvanTek 40 Dual Range Disconnect Drive Axle [VIDEO]

Equipment Editor Jim Park test drives a truck equipped with the Dana Spicer AdvanTek 40 Dual Range Disconnect Drive Axle to see how the technology provides the advatages of a 6x2 and 6x4 configuration without the drawbacks of either. 

The Downspeeding Learning Curve

Today's "downsped" drivetrains can improve fuel economy, but high torque and low axle ratios can create all sorts of havoc with drivetrain components.

Dana Delivers Web-Based Training to Clarify Downspeeding

Dana's new online course will delve into the basic principles, benefits, and challenges associated with engine downspeeding. It also provides a one-stop source for key drivetrain system knowledge, individual component specifications, literature, videos, images, service bulletins, and parts books.

Powertrain Specs: More Science Than Art

Torque is both an enabler of downspeeding and a source of concern about delivering peak torque at very low engine speed.

Test Drive: Western Star 5700XE

Western Star’s 5700XE might just be everything to everyone. It’s a big classic-styled truck with second-to-one aerodynamics.

Commentary: When Well-Intentioned Rules Have Unintended Consequences

Keep up the good work on cutting fuel use, but make sure to do your homework.

Meritor Adds Drivelines for Heavy Service Fleets

SAN DIEGO -- Meritor is adding the RPL35 and RPL35SD drivelines to its Permalube RPL family of truck drivelines designed for heavy service applications.

Meritor Adds Two New Axle Ratios to Improve Fuel Efficiency

Two new axle ratios are available from Meritor, optimized to meet trucking's demand for improved fuel efficiency. Lower axle ratios promote downspeeding for optimum fuel efficiency.