Red Line 75W140NS Gear Oil Quart - Part Number RED57104

• Also used in clutch-type limited slip differentials in racing for maximum lock up-some users add Limited Slip Friction Modifier in small doses to customize slippage
• Popular for historic and vintage transmissions, like Mid-1930s to early-1950s synchro-equipped gearboxes in cars and trucks
• Contains extreme pressure additives like our 75W140 GL-5 oil, but lacks friction modifiers to balance slipperiness
• Helps with noisy or rough shifting in troubled A-833 Dodge/Plymouth 4-speed transmissions from 1964 to 1969
• Option for noisy transmissions when mixed with 75W90NS or MT-90 to bring viscosity level up
• Non corrosive formula, safe for use with all synchro materials

Red Line 75W140NS Gear Oil is a non-slip differential and manual transmission lubricant formulated for applications that require extreme-pressure protection without added friction modifiers. Its friction-modifier-free formula helps maintain strong gear engagement and maximum lockup in clutch-type limited-slip differentials, making it a practical choice for racing applications where controlled slippage is important.

This Red Line gear oil is also well suited for historic and vintage manual transmissions, including synchro-equipped gearboxes used in cars and trucks from the mid-1930s through the early 1950s. It can help address noisy or rough shifting in select A-833 Dodge and Plymouth 4-speed transmissions from 1964 through 1969. When additional viscosity is needed, it may also be blended with Red Line 75W90NS or MT-90 to help tune transmission performance. The non-corrosive formulation is compatible with common synchronizer materials.

• Application: Manual transmissions, racing gearboxes, and clutch-type limited-slip differentials
• Viscosity: SAE 75W-140
• Gear Oil Type: Non-slip, friction-modifier-free formulation
• Performance Level: Contains extreme-pressure additives comparable to GL-5 gear oil
• Synchronizer Compatibility: Safe for use with all synchro materials
• Limited-Slip Use: Supports maximum lockup; friction modifier may be added in small amounts to adjust slippage
• Blend Compatibility: Can be mixed with 75W90NS or MT-90 when appropriate to increase viscosity
• Packaging: Quart container

What's Included: One quart of Red Line 75W140NS Gear Oil, Part Number RED57104.

Fitment: Suitable for select vintage and historic manual transmissions, racing applications, clutch-type limited-slip differentials, and A-833 Dodge and Plymouth 4-speed transmissions from 1964 through 1969. Always verify lubricant requirements and application compatibility before installation.

Features:

• Friction-modifier-free formula supports maximum lockup in clutch-type limited-slip differentials
• Extreme-pressure additives help protect gears under demanding racing and performance conditions
• Suitable for many historic and vintage synchro-equipped manual transmissions
• May help reduce noisy or rough shifting in select A-833 Dodge and Plymouth 4-speed transmissions
• Can be blended with 75W90NS or MT-90 when additional viscosity is needed
• Non-corrosive formulation is safe for use with all synchronizer materials