Chemicals & Fluids › Transmission Oil Image 1 of 1 Transmission Oil $12.95 Developed for use in 4, 5 and 6 Speed Harley Davidson transmissionsBlended for ultra high film strength offering excellent wear protection and durabilityHarddrive's extreme pressure additive package provides smooth shifting across all RPM rangesMeets or exceeds API GL-5 classificationsSold in quarts (12 per case) Quantity: Purchase Added! Developed for use in 4, 5 and 6 Speed Harley Davidson transmissionsBlended for ultra high film strength offering excellent wear protection and durabilityHarddrive's extreme pressure additive package provides smooth shifting across all RPM rangesMeets or exceeds API GL-5 classificationsSold in quarts (12 per case)