Best Red Line Transmission Fluids in 2026

This product dampens transmission noise (reducing the notorious shifting clunk found in these gearboxes), dramatically reduces temperature, provides thicker oil films between gear teeth and resists throw-off

Compatible with all aftermarket versions like Baker, JIMS, S&S, etc.

Compatible with all HD trans including with Milwaukee-Eight engines, Evolution engines, Twin Cam engines and latest 6-speed Cruise Drive

Red Line 50304 Manual Transmission (MT) 90W Gear Oil

LONGER SYNCHRO LIFE - High-performance gear protection, satisfies the gear oil viscosity requirements of 75W, 80W and motor oil viscosities of SAE 30, 10W30, 5W31

OFFERS QUICKER SHIFTS - MLT Gear Oil with balanced friction control for most manual transmission synchronizers. Other synthetic gear oils are often too slippery

SAFE FOR BRASS SYNCHROS - As it lacks the reactive sulfurs found in most GL-5 oils that cause damage. Recommended for GL-1, GL-3 & GL-4 applications

This 75W85 GL-4 gear oil is designed to fill the viscosity gap between MTL (70W80 GL-4) and MT-90 (75W90 GL-4), making it a perfect fit Compatible with many Nissan, Mitsubishi, Hyundai, Kia and NV4500 pickup truck transmission Compatible with.

Backward compatible with previous Dexron automatic transmission fluids and can be used as a much-improved replacement for older vehicles/transmissions originally using previous Dexron fluids

Improved performance over previous Dexron fluids in: friction durability, viscosity stability, aeration and foam control, and oxidation resistance

Potential to enable improved fuel economy and longer transmission life

Our most versatile ATF, for use in automatic, manual transmissions and power steering

Popular applications: Toyota Type T-III and T-IV, Honda ATF-Z1, Nissan Matic D, J & K, Diamond SP-II, SP-III, Mazda ATF M-V, most BMW and Audi/VW automatic transmissions

Also used with manual transmissions and transaxles like T-5, T-45, T-56 and late-model BMW, provides a GL-4 level of gear protection

SUITABLE FOR USE IN 95% of ATF VEHICLES in operation with US registered light duty applications.

HIGH PERFORMANCE CONDITIONING AGENTS prolong seal elasticity to prevent leaks

IMPROVE DURABILITY & TRANSMISSION LIFE with anti-wear technology to avoid costly repairs

Enhanced Friction Durability For Smooth Transmission Performance

Meets Mercon And Dexron-Iiih Requirements

Also Satisfies Requirements Of Dexron, Dexron-Iii, Iie And Ii

Prevents overheating, reducing elevated operating temperatures up to 40 degrees Farenheit - Optimizes total transmission performance

Eliminates transmission fluid foaming and oxidation and reduces wear throughout the transmission

Eliminates clutch chatter and torque converter shudder; Softens and modifies harsh shifts making them quicker in duration

Lucas Transmission Fix Stops Slip, Hesitation, Rough Shifting In Worn Transmissions And Completely Eliminates Most Seal Leaks

Fit Type: Universal

Can be added to existing fluid without draining any out

Good frictional characteristics and wear protection provide enhanced cold temperature performance, excellent friction retention, and smooth shifting

High oxidation resistance fortifies against rust and corrosion and provides for longer fluid change intervals

Wide range of seal compatibility - can be used in an extensive variety of vehicles/transmissions

PERFORMANCE – Formulated to provide smooth shifting

PROTECTION – Provides outstanding wear protection in transmissions and primary chaincases

PEACE OF MIND – Special additives are designed to provide shear stability. Meets or exceeds manufacturer’s warranty requirements Using this product will not void manufacturer warranties.

Recommended replacement part for your GM vehicle’s original factory component

Offering the quality, reliability, and durability

Manufactured with GM Original Equipment specification for fit, form, and function