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Mack adds split-shaft function to mDRIVE HD

Mack Trucks on Tuesday at World of Concrete in Las Vegas introduced a standard split-shaft functionality for its 12-, 13- and 14-speed mDRIVE HD automated manual transmission.

Mack Construction Product Manager Tim Wrinkle says the split-shaft functionality offers the benefits of the mDRIVE transmission to customers who need higher PTO power and torque.

Rather than taking power from an engine- or transmission-mounted PTO, split-shaft PTOs are mounted in the middle of the driveline to get output directly from the transmission, supplying more torque for auxiliary equipment.

When the split-shaft PTO is engaged, power to the axles is disconnected.

All GHG2017 F-Series mDRIVE HD AMTs can be reprogrammed with split-shaft functionality with assistance from the Mack Body Builder Support Group, allowing the transmission start in 7th thru 12th gears and shift to a desired continuous operation gear of 11th or 12th.

Mack debuts online work truck configurator

Applications covered include tractors, concrete mixers and dumps, as well as rear loaders and roll offs for refuse.


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Jason Cannon is the Equipment Editor for Commercial Carrier Journal and Overdrive, and is a Class A CDL holder. Reach him at