Red Line 75W90 NS Gear Oil is designed for transmissions and transaxles - helps to slow synchros for easier shifting across a broad temperature range. Contains extreme pressure additives like Red Line 75W90 GL-5 oil, but lacks friction modifiers to balance slipperiness. Improved copper corrosion protection to prolong synchro life and helps with lock-up on weak limited-slip differentials.

Compatible with Red Line Limited Slip Friction Modifier for tuning slippage.

Also used with clutch-type LSDs in racing for maximum lock up.