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Red Line 75W140NS gear oil is a high-viscosity formulation without friction modifiers, used in clutch-type limited-slip differentials in racing for maximum lockup when desired. Popular in vintage and historic synchro-equipped transmissions, it helps noisy or rough-shifting A-833 Dodge/Plymouth 4-speed boxes when mixed or used to raise viscosity, and is non-corrosive and safe for synchronizer materials.
Red Line 75W140NS Gear Oil - Gallon
