Archoil AR9100 (8 oz) Friction Modifier - Treats Up to 8 Quarts of Engine Oil
This is genuine Dana/Spicer posi trac or limited slip differential additive. You add this to the gear oil of your choice to help lubricate the
Dana Spicer Posi Trac Limited Slip Differential Friction Modifier Gear Oil Additive Chevy Ford Dodge GM Jeep
If you got Limited Slip- Don't forget Friction Aditive
Ford Genuine Ford Fluid XL-3 Friction Modifier
Dana 44 Locking Differentials-Broncograveyard.com
DIFFERENTIAL OIL ADDITIVE FRICTION MODIFIER - Broncograveyard.com
1988 Ford Bronco Differential Oil Additive Accessories and Fluids
Motorcraft XL3: Friction Modifier, Limited-Slip, 4 oz., Each - Don't let your differential give you the slip-up. Be smart and use Motorcraft limited-slip friction modifier, a specially formulated gear oil additive. This additive is ideal for certain type limited-slip differentials to help reduce chatter and minimize hypoid gear noise levels.
Ford Genuine Ford Fluid XL-3 Friction Modifier Additive - 4 oz.
Dana 44 Tools-Broncograveyard.com
UHP Friction Modifier Additive (Differentials & Manual