Peterbilt Motors has introduced the Off-Road Calibration and Rock-Free Mode features for the Paccar TX-18 PRO transmission on 567, 389 and four other models. The transmission affords excellent productivity, efficiency and uptime for a superior driver experience for on- and off-highway, Peterbilt engineers note, and is paired exclusively with the Paccar MX-11 or MX-13 engines. It is designed to perform in a variety of vocational applications including heavy haul, dump truck, wreckers and cranes. The combination of the TX-18 PRO transmission and a MX engine provides up to 1,850 lb.-ft. of torque and rating up to 140,000 lbs. GCWR.

The TX-18 PRO transmission ships with the newly released Off-Road Calibration. Switching between the primary and new mode can be done in a matter of seconds using the stalk-mounted shifter. Off-Road Calibration learns road terrain and surface conditions and responds automatically for an improved driver experience. It minimizes unnecessary shifting and maximizes time in gear in challenging terrain.

Rock-Free Mode is also standard on the TX-18 PRO transmission; if off-road conditions impact maneuverability, it can be engaged with the flip of a switch. Once engaged, the transmission can be quickly shifted between drive and reverse to rock free, fully enabling the truck and then automatically returning to its default setting. — Peterbilt Motors Co., Denton, Texas;