The Red Line 75W140NS Gear Oil is designed for use in high-performance limited slip differentials and vintage transmissions, including models from the mid-1930s to early-1950s with synchro-equipped gearboxes. Its formulation includes extreme pressure additives that provide excellent protection and maximum lock-up in clutch-type limited slip differentials used in racing and heavy-duty applications. Some users enhance its performance further by adding limited slip friction modifiers to tailor slip characteristics, making it a versatile choice for customized setups. This gear oil's robust composition helps minimize chatter and slipping, ensuring smoother operation in demanding conditions.
Ideal for historic and vintage vehicles, the Red Line 75W140NS does not contain friction modifiers, maintaining a balanced level of slipperiness critical for certain transmissions. It also addresses common issues such as noisy or rough shifting in troubled A-833 Dodge/Plymouth 4-speed transmissions from 1964 to 1969 by providing superior lubrication and reducing metal-to-metal contact. When mixed with products like 75W90NS or MT-90, it can increase viscosity, making it suitable for a wider range of transmission types, especially where higher lubricity is required.
This gear oil is formulated to be non-corrosive and compatible with all synchro materials, ensuring long-term transmission health. Its advanced additive package delivers extreme pressure protection, reducing wear during high-stress operation, and helping extend the lifespan of your transmission components. Suitable for both racing and classic vehicle restoration, the Red Line 75W140NS gear oil offers a reliable solution for maintaining optimal performance in demanding automotive environments. It is shipped as a quart-sized container, with 12 units per SKU, for convenient distribution and application.
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