Spicer Trac-Lok Limited Slip Axle Friction Modifier Additive (4 Fluid OZ)

Eliminate harsh rear-end chatter, stop aggressive clutch binding, and restore smooth, quiet cornering to your vehicle with this genuine Spicer Limited Slip Friction Modifier Additive. Specifically formulated by Dana for high-performance and utility differentials, this premium 4-ounce fluid treatment optimizes the slip coefficients within Trac-Lok, Power-Lok, and standard limited-slip (posi) clutch packs.

In a limited-slip differential, internal friction clutches constantly engage and disengage to distribute torque between the rear tires. Over time, standard gear oil loses its specialized friction characteristics, causing the internal clutch discs to grab and stick violently instead of sliding smoothly. This stick-slip action creates a highly noticeable chatter, shudder, or low-pitched groaning noise whenever you make sharp turns from a dead stop or maneuver into parking spaces.

This original equipment manufacturer (OEM) additive serves as a highly specialized fluid enhancer. Sourcing a genuine Spicer fluid formulation guarantees exact chemical compatibility with factory clutch friction materials, preventing premature disc glaze and protecting the internal spider gears from thermal breakdown. Adding this fluid treatment lowers internal operating temperatures and dampens stick-slip harmonics without causing the differential to lose its core power-splitting traction capabilities.

Product Highlights:

• Genuine Spicer OEM Formulation: Engineered by the original axle manufacturer to ensure exact chemical harmony with factory Trac-Lok and Power-Lok clutch friction linings.

• Eliminates Differential Chatter: Modifies fluid friction thresholds to stop aggressive stick-slip shuddering and popping noises during tight turning maneuvers.

• Extends Clutch Pack Life: Prevents hot-spot glazing on the internal metal and composite discs, preserving your differential's long-term torque bias profile.

• Universal Application: Formulated to safely enhance any high-quality mineral or synthetic gear oil setup requiring a limited-slip (LS) additive.

Application & Fluid Guidelines:

• Differential Profiles: Fits all Dana 30, Dana 35, Dana 44, Dana 60, Dana 70, and Dana 80 rear or front housings equipped with clutch-driven limited-slip carriers.

• Usage Instructions: Shake well before using. Pour the entire 4-ounce bottle directly into the differential housing center section alongside your standard gear oil during a fluid service or to treat an active chatter condition.

• Please Note: This chemical modifier is designed strictly for clutch-style limited-slip differentials. Do not use this product in standard open differentials, completely automatic mechanical lockers (such as a Detroit Locker), or selectable air/cable/electric locking differentials.