The PACCAR 40K Tandem Axle’s superior design helps you reach your destination with improved efficiency and durability.


A lightweight solution 

Advanced manufacturing processes make the PACCAR 40K axle up to 150 pounds lighter. When combined with the PACCAR MX-13 engine and PACCAR transmission, the overall weight reduction could be as much as 500 LBS.

Thru-shaft pinion design 

The 40K tandem axle is the first high-performance axle with thru-shaft pinion design, transferring full engine power straight to the road.

Advanced laser welding 

An innovative laser-welded carrier design reduces weight and improves fuel economy without sacrificing an ounce of durability.



  • Durable pinion thru-shaft design improves internal efficiencies
  •  Spiral bevel gearing optimizes inter-axle driveline angles
  • High efficiency pinion and differential bearings reduce power losses
  • Advanced laser welding eliminates internal fasteners
  • Driver controlled forward axle differential lock
  • Advanced manufacturing processes achieve up to 150lbs. weight savings



  • GCW: 80,000 lbs.
  • GAWR: 40,000 lbs.
  • Tandem Ratio Range: 2.47 to 3.70
  • Straight Torque Rating: 1,650 lb-ft.
  • Multi-Torque Rating: 1,850 lb-ft.
  • Warranty: Five Years/750,000 miles