Mack mDRIVE XHD 14CR Automated Manual Transmission

The Mack mDRIVE® XHD 14CR is the most rugged member of the mDRIVE transmission family, designed for extreme-duty vocational and off-highway applications. The “XHD” designation identifies its reinforced, extra heavy-duty construction, while “14CR” specifies a 14-speed gearbox with multiple deep-reduction creeper gears, giving drivers unmatched control when starting heavy loads, climbing steep grades, or maneuvering in soft terrain.

Built to handle the toughest conditions, the mDRIVE XHD 14CR integrates seamlessly with Mack MP® engines to deliver massive torque handling, intelligent shifting, and enhanced driver comfort. Its automated two-pedal design eliminates the clutch pedal, making it easier to operate under severe-duty conditions while still maximizing fuel efficiency and uptime.

Key Features

• Automated Manual Transmission (AMT) for improved fuel economy and reduced driver fatigue
• 14 forward speeds with dual creeper gears for ultra-low-speed control in heavy haul and off-highway operations
• Extreme heavy-duty construction built for maximum durability and torque capacity
• Advanced driver-assist functions including Grade Gripper, Rock Free, Power Launch, Heavy Haul Shift, and Enhanced Construction Shift
• Direct integration with Mack MP8, MP8HE, and MP13 engines for seamless power delivery
• Multiple PTO options available for vocational equipment such as dumps, mixers, oilfield rigs, and specialty trucks
• Optimized shift logic adapts to terrain, payload, and operator input for peak performance
• Aluminum housing with reinforced internals balances weight savings with extreme-duty strength

Technical Specifications

• Type: Extreme Heavy-Duty Automated Manual Transmission (XHD AMT)
• Speeds: 14 forward (with dual creeper gears), multiple reverse ratios
• Torque Capacity: Up to 2,060 lb-ft
• Shift Control: Electronic, dash-mounted selector with Economy, Performance, and Manual modes
• Weight: ~850–875 lbs (depending on PTO configuration)
• Lubrication: Synthetic oil with extended service intervals to reduce downtime