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I just finished replacing the engine/gearbox/OD/differential fluids, having put a 1000 miles on the rebuilt drivetrain. Aside from my travails with the oil filter canister (separate thread), I'm most pleased with swapping out SAE 30 non-detergent motor oil for Redline's MT-90 GL4 gear oil. I immediately noticed smoother, quieter shifting. It was an amazing difference!