Our precision-built transmissions are engineered from the ground up for intuitive operation and superior performance. Their intelligent features use look-ahead technology to execute shift decisions that improve fuel economy and driver comfort.

TX-18

The new PACCAR TX-18 transmission delivers productivity, efficiency, and uptime to conquer tough jobs.

High Performance Meets Rugged Durability and Efficiency

Twin-countershaft design with helical gears and large bearings optimized for higher engine torque and weights.

Best overall gear ratio coverage with small, even steps for smooth shifts and excellent performance in all driving conditions.

Extreme duty clutch allows more controlled clutch slip and increased maneuvering time at higher loads.

Select each spot to learn more.

Advanced engineering

The PACCAR TX-18 combines performance and rugged durability needed to get tough jobs done. Optimized for integration with MX Engines and ideal for on-highway high performance and light vocational applications. PACCAR also offers the TX-18 Pro which allows for on- and off-highway high performance, severe service, and heavy vocational needs.

Feature Definition
Gears

18 Forward/1-6 Reverse

Max. Horsepower 510 HP
Torque Capacity 1,850 lb.-ft.
Maximum Operating Weight 140,000 lbs.
Oil Capacity 25.4 PINTS¹
System Weight (transmission, clutch, and oil) 808 LBS (TX-18)
813 LBS (TX-18 PRO)
PTO Max Capacity 8-BOLT, BOTTOM MOUNT; 4-BOLT REAR MOUNT – COMBINED 160 HP
Fluid Pressure Sensor PROTECTION FROM GEAR BURNUP
Maintenance Intervals ON-HIGHWAY: 500,000 MI/5 YRS
VOCATIONAL: 250,000 MI/3 YRS
CLUTCH: MAINTENANCE FREE

¹ For coolerless, non-PTO configuration
² TX-18 Pro Only
Note: Some features and specifications not available with all configurations.

Warranty Definition
Linehaul 5 YRS/750,000 MILES
Standard (Construction, Pickup & Delivery) 3 YRS/300,000 MILES
Severe Duty (Pro only) 2 YRS/UNLIMITED MILES
Ratios
1st 14.32
2nd 11.96
3rd 10.02
4th 8.43
5th 7.04
6th 5.9
7th 4.95
8th 4.13
9th 3.46
10th 2.89
11th 2.41
12th 2.02
13th 1.7
14th 1.42
15th 1.19
16th 1
17th 0.83
18th 0.7
R1 15.25
R2 12.73
R3 10.67
R4² 3.08
R5² 2.57
R6² 2.15
OVERALL 20.46

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