75W140NS GEAR OIL 3,785 LTR Contains extreme pressure additives like our 75W140 GL-5 oil, but lacks friction modifiers to balance slipperiness. Popular for historic and vintage transmissions, like Mid-1930s to early-1950s synchro-equipped gearboxes in cars and t75W140NS GEAR OIL 3,785 LTR Contains extreme pressure additives like our 75W140 GL-5 oil, but lacks friction modifiers to balance slipperiness. Popular for historic and vintage transmissions, like Mid-1930s to early-1950s synchro-equipped gearboxes in cars and trucks. 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. 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. Non corrosive formula, safe for use with all synchro materials.