Dana Incorporated’s new Spicer Trac-Lok limited-slip differentials (LSD) for medium-duty truck applications autonomously delivers improved vehicle handling within a lightweight and compact design for maximum traction, durability, and performance, according to the manufacturer. 

By limiting wheel-slip rather than fully locking, Spicer Trac-Lok acts as an open differential and freely differentiates in normal operating mode.  During a slip event, it automatically sends approximately three times more torque to the high traction wheel-end and then automatically returns to full differentiation as conditions change, transmitting engine power, enabling stable turns, and boosting driver productivity.

“Spicer Trac-Lok provides improved traction capability without the driver engaging any switches or mechanisms, reducing frequent incidents of poor traction and lessening instability during turns. It also places less stress on the axle shafts, promoting longer part life and preventing unnecessary tire wear," said Bill Nunnery, senior director, sales and marketing, global aftermarket for Dana Incorporated. 

Featuring a five-pinion pair design to serve a variety of Class 6 and Class 7 applications, Spicer Trac-Lok has no wiring or pneumatic connections and no special lubricants or friction modifiers are required. It provides lifetime torque bias performance and can be retrofit with existing Spicer S110, S111, S130, and S140 medium-duty drive axles with no wiring, sensors, air hoses, or pneumatic connections.  It does not require switches, special lubricants, or friction modifiers to operate.