Lubegard 61910 Highly Friction Modified ATF Supplement, 10 oz. Converts DEXRON II, III / MERCON ATF into a Highly Friction Modified ATF - Transmissions perform more efficiently at lower operating temperatures Anti-chatter in clutch packs (allow penetration overnight for maximum benefit), Anti-shudder with converter clutches (allow penetration overnight for maximum benefit) Prevents overheating, Assists in freeing hung-up governors, Keeps valves free Provides for smoother shifting and reduces drive train power losses, Helps modify harsh shifts and makes them quicker in duration Maintains proper ATF viscosity in torque converters, Inhibits transmission fluid foaming and oxidation, thereby extending fluid life and Reduces transmission wear