Kenworth announced that the new Paccar TX-18 and Paccar TX-18 Pro automated transmissions for Class 8 heavy on-highway and select off-highway vocational applications are now available for order.

Both 18-speed transmissions build upon the efficiency of the Paccar TX-12, according to Kenworth. The Paccar TX-18 offers additional capability for heavy on-highway use for applications, such as heavy haul transport. The Paccar TX-18 Pro adds enhanced capabilities and features for extreme duty vocational applications and other select off-highway applications.

The new transmissions are available with the Kenworth T680, T880, and W990 equipped with the Paccar MX-13 and Paccar MX-11 engines. Engineered to operate with the Paccar MX engine platform, the new TX-18 and TX-18 Pro transmissions support maximums of 510 horsepower, 1,850 lb-ft of torque capacity, and 140,000 pounds of gross combination vehicle weight (GCVW).

The new 18-speed ratio provides performance in a wide range of operating applications. The TX-18 has three reverse gears, and TX-18 Pro has six, which pairs well with deep axle ratios. Multiple reverse gears allow for improved maneuverability around job sites. 

Both transmissions offer expanded high-capacity PTO functionality with an eight-bolt bottom mount and four-bolt rear mount for a combined 160 hp capacity at 1,400 RPM.

The transmissions are equipped with an internal oil temperature sensor. The sensor shows transmission temperatures on the in-cab 15-inch digital display and provides driver notifications.

The TX-18 and TX-18 Pro are standard with Kenworth’s column-mounted, right-hand shifter.

On-highway maintenance intervals are 500,000 miles or five years, and vocational intervals are 250,000 miles or three years for the TX-18 and TX-18 Pro. The transmissions utilize a maintenance-free clutch.

The TX-18 and TX-18 Pro join Kenworth’s Paccar transmissions lineup, which include the Paccar TX-12 automated transmission for fuel efficient, on-highway applications and the Paccar TX-8 automatic transmission standard on Kenworth’s new medium-duty models.