Red Line Synthetic MTL 75W80 GL4 Manual Transmission Gear Oil 1 Quart
If your Corvette’s manual transmission has been feeling crankier than a hungover pit crew, this MTL 75W80 GL-4 gear oil is the smooth-talking fix it’s been begging for. It replaces that old GM Synchromesh 12345349 with something actually worthy of your gearbox, giving your brass synchros a break thanks to zero reactive sulfurs and all the right friction characteristics. Translation: quicker shifts, no more cold-morning notchiness, and a happier transmission that won’t grind back at you. Whether you're rowing through gears on a high-mile cruiser or a perfectly preserved Corvette, this stuff delivers the gear protection and synchro life your Corvette deserves without turning your transmission into a crunchy bag of regret.
- Compatible replacement for GM Synchromesh 12345349
- Safe for brass synchros with GL-4 formula
- Eliminates notchy shifting, even in cold weather
- Provides faster, smoother gear engagement
- Ideal for 1989-1996 Corvette ZF manual transmissions
- Meets 75W80 gear oil and SAE 30, 10W30, 5W30 viscosity needs
- Recommended for GL-1, GL-3, and GL-4 applications
- Excellent high-mileage and low-mileage transmission protection
Also known under these part numbers: (For reference only)