Chemically, friction modifiers are polar molecules. One end of the molecule attaches to the metal surface of the clutch plate, while the other end stays suspended in the oil. This creates a microscopic, slippery "cushion." When the clutches compress, the modifier allows them to slide against each other more smoothly before fully locking. By reducing the "static" friction (the force needed to start movement) to a level closer to the "dynamic" friction (the force during movement), the transition becomes seamless, eliminating the chatter. Application and Importance
To understand why this modifier is necessary, one must understand how a Limited-Slip Differential works. Unlike an open differential, an LSD uses a series of clutch plates to ensure that power is distributed to both wheels, even if one loses traction. However, these clutches are prone to a physical occurrence known as the "stick-slip" phenomenon. mopar-friction-modifier
Without the proper lubricant chemistry, the clutch plates can grab and release rapidly during low-speed turns. This manifests as a distracting shudder, mechanical vibration, or "chattering" sound. Over time, this excessive friction doesn't just cause noise; it leads to premature wear of the clutch discs and increased heat within the differential housing. The Solution: Chemical Boundary Lubrication Chemically, friction modifiers are polar molecules
The standard application usually involves adding a 2-ounce or 4-ounce bottle to the differential during a fluid service. It is widely considered a "maintenance essential" for owners of vehicles equipped with Trac-Lok or Vari-Lok systems. Conclusion By reducing the "static" friction (the force needed